Introduces the essential technical concepts and Domino environment required for the administration. Also outlines the responsibilities of the System Administrator. Reference: Lotus Domino Admin Help

1. Lotus Domino Admin Training
Essential Concepts
(c) Sanjaya Kumar Saxena
Introduces the essential technical concepts and Domino
environment required for the administration. Also outlines
the responsibilities of the System Administrator.
Reference: Domino Admin Help

2. Directory and Directory Services
Printed directories, alphabetical or
classified lists of resources containing
names, locations and identifying
information, are important
information tools in the provision of
library services. Most often these are
directories of people and
organizations, listing inhabitants of a
specified locality (e.g., a city directory),
users or clients connected with a
particular profession or occupation
(e.g., a directory of manufacturers), or
those who subscribe or use a
particular service (e.g., a telephone
directory).
In a LAN or WAN, this directory
information may be used for e-mail
addressing, user authentication
(e.g., logins and passwords), or
network security (e.g., user-access
rights). A directory may also contain
information on the physical devices on
a network (e.g., PCs, servers, printers,
routers and communication servers)
and the services available on a
specific device (such as operating
systems, applications, shared-file
systems, print queues). This
information may be accessible to
computer applications and users.
The users of the directory, including
people and computer programs, would
be able to read or modify the
information or parts of it, as long as
they had the authorization to do so.
This idea grew into the definition of X.
500.
‣ List of Resources
‣ Used for Locating Resources
‣ Typical examples are:
• Yellow Pages
• Telephone Directory Inquiry Services
notes

3. notes
X.500 Functions
During the 1980s, the growth in
implementations of wide area network
communication forced the deployment
of a new set of networking protocols
called open system interconnection
(OSI). OSI presented a seven layer
model of communications. Part of the
standards developed by CCITT is a
definition of generic directory service.
CCITT defined the first X.500 standard
in 1988, which then became ISO 9594,
Data Communications Network
Directory, Recommendations X.500/X.
521 in 1990, though it is still
commonly referred to as X.500.
‣ Provide a global, unified naming service for all elements in
a network
‣ Translating between network names & addresses
‣ Provide description/attributes of all objects in a directory
‣ Provide unique names to all objects in a directory

4. X.500 Directory Information Base
For example, unique id for Sanjaya
Kumar Saxena working in technical
dept. at ACME Systems in India will
be: CN=Sanjaya K Saxena,
OU=Technical, O=ACME Systems,
C=IN
‣ DIB is organized in a tree structure known as Directory
Information Tree (DIT)
notes

5. X.500 Accessing DIB
The Directory Access Protocol (DAP)
defines how DUAs get access to the
information stored in DSAs.
A Directory Service Protocol (DSP) is
used between two DSAs to query user
information lookups over multiple
DSAs.
A set of one or more DSAs and zero or
more DUAs managed by a single
organization may form a Directory
Management Domain (DMD).
A DMD may be an Administration
DMD (ADDMD) or a Private DMD
(PRDMD), depending on whether or
not it is being operated by a public
telecommunication organization or by
service provider.
DSA
DSA
DSA
DUA
DUA
DUA
User
User
DSP
DAP
notes

6. LDAP
LDAP evolved as a lightweight
protocol for accessing information in
X.500 directory services. It has since
become independent of X.500. LDAP
runs over TCP/IP rather than the OSI
protocol stack. The functional model
of LDAP is simpler compared to X.500.
LDAP defines the content of messages
exchanged between an LDAP client
and an LDAP server. The messages
specify the operations requested by
the client (for example search), the
responses from the server, and the
format of data carried in the
messages. LDAP messages are
carried over TCP/IP, a connection-
oriented protocol; so there are also
operations to establish and disconnect
a session between the client and
server.
LDAP typically defines operations for
accessing and modifying directory
entries such as:
• Searching for entries meeting user
specified criteria
• Adding an entry
• Deleting an entry
• Modifying an entry
• Modifying the distinguished name
or relative distinguished name of
an entry (move)
• Comparing an entry
‣ Lightweight Directory Access Protocol
‣ Based on X.500 DAP
• But the light weight version
- Uses TCP/IP instead of OSI
- Simple protocol and functional model
- Esoteric capabilities dropped
‣ LDAP V2 finalized in 1995
‣ LDAP V3 recently released
• RFC 2251-56
notes

7. LDAP Models
Information Model describes the
structure of information stored in an
LDAP directory.
Naming Model describes how
information in an LDAP directory is
organized and identified.
Functional Model describes what
operations can be performed on the
information stored in an LDAP
directory.
Security Model describes how the
information in an LDAP directory can
be protected from unauthorized
access
‣ Informational Model
• Directory composed of objects/entries
• Object/entries organized hierarchically
• Each object/entry has one or more attributes
• Each attribute has one or more value
• Schema define object classes to categorize them
‣ Functional Model
• Authentication Operations: Anonymous, User id, Clear-
text password
• Interrogation Operations: Search, Compare
• Update Operations: Add, Delete
• Modify
notes

8. LDAP - More Concepts
‣ Chaining
• Server forwards requests and returns to clients
‣ Referrals
• Server returns referral information to client
‣ Replication
• No industry standard yet, Domino is the leader

9. LDAP Usage
‣ Internet Mail
‣ White/Yellow Pages Lookup
‣ PK Management
‣ Policy based management in networks
‣ Directory Synchronization

10. Dual Key Encryption
‣ Issues Resolved
• Communicating keys
• Change Management
• Degree of Security
E
MESSAGE
#$%&*@! D#$%&*@!
MESSAGE
Secret (or Public) Key Public (or Secret) Key
From ancient times until 1976 there
was only conventional cryptography,
which uses the same key to both
scramble (encrypt) and unscramble
(decrypt) information. It has following
issues:
• Communicating keys
• Managing large number of keys
• Change Management
• Degree of Security
• Authentication of sender
• Integrity of message
One key is designated as SECRET(Ks)
and the other as PUBLIC(Kp).
Dual key cryptography is based on
two keys, a private key and a public
key. Single key cryptography is a one
key system for both locking
(encrypting) and unlocking (decrypting)
a message, whereas dual key (or
public key) cryptography uses different
keys for locking and unlocking. In
public-key systems, one key can be
kept private or secret while the other
key is made public; knowing the public
key does not reveal the private or
secret key.
notes

11. Digital Signatures
As illustrated, to create a fixed length
digital signature sender uses a hashing
function that converts a message of
any length to the same fixed length
hash, or digest, of the message.
The Secure Hash Algorithm (SHA) is a
known hash function that is part of the
Digital Signature Standard. This hash
of a message is like a "fingerprint" of
the message in that it is practically
impossible for two distinct messages
to result in identical hashes of these
messages. After creating a hash of the
message, sender then applies his/her
secret key to the hash to create her
digital signature for this message.
E
MESSAGE
D-Signature +
Your Secret Key
#
MESSAGE
D-Signature
HASH
A
notes

12. Digital Signatures Verification
Receiver uses sender’s public key to
convert the digital signature to the
hash that sender had computed for
his/her message.
Next, receiver takes the plaintext
message that he had received and
applies the same hash function to it
and gets the hash of the received
message.
If the hash of the received message is
identical to the hash obtained by using
sender's public key to convert the
digital signature, then receiver has
authenticated sender's digital
signature and verified the integrity of
the signed message.
‣ Issues Resolved
• Ensure integrity of message
• Authenticate Senders
‣ Plus
• Practically impossible to counterfeit
• Easy to verify
D
Your Public Key
#
MESSAGE
D-Signature
{
} HASH
HASH
Same ?
}
Verified Not Verified
A
notes

13. Certificate Concepts
However, we still need to know,
without doubt, that the owner of a
public key is who he claims to be. This
involves the intervention of a
disinterested, trusted third party that
binds a public key to an individual or
entity that it has positively identified.
This binding mechanism is know as a
digital certificate. A digital certificate
can be considered analogous to a
passport.
Like a passport, a certificate serves as
a credential; it contains information
that establishes an individual's identity,
along with a unique identifying
number. It is an electronic credential
that contains specific identification
information-name, address, and
company-along with the individual's
public key. With a passport,
information is verified and sealed by a
government (a trusted authority) so
that it is tamper-proof. The
government seal attests to the binding
of the individual and the passport
number.
A digital certificate is a non-forgeable,
tamper-proof electronic document that
attests to the binding of an individual's
identity with his or her public key. The
information contained in the certificate
is verified and sealed with the digital
signature of a trusted third party, know
as a Certificate Authority (CA). To
solve this problem, the United States
Postal Service (USPS) is planning
certificate services for these digital
signatures.
‣ Like Passport or Driving License
‣ Must exist an Issuing Authority
‣ Certificate and Certification Authority (CA)
Certificate
NAME
PUBLIC KEY
EXPIRY DATE
ISSUER ID
OTHER ATTRIBUTES
CA’s DIGITAL SIGNATURE
notes

14. Certificates Establishing Secured Transaction
Certificates along with digital
signatures can be used to establish a
secured transaction between two
resources without putting any thing
confidential in plain text on the wire.
Remember, server and requester are
two networked resources. For
example, one can be user workstation
and another can be a mail server.
‣ Validate by
• Establishing Trust
- Certificates are exchanged
- after masking private data, if any
- By Comparing the certificates
- Trust the public key, if the two have common
certifier
- Possible in hierarchical situation
‣ Authenticate by
• Challenging each other
- Requester generates a random # and challenges
the server to sign it
- Server signs and sends it back
- Requester verifies the signature
- Same process repeats for server also
- If both can verify, authentication is successful
notes

15. Internet Mail Addressing
This was designed for ASCII text (7-
bit) messages only. To send and
receive 8-bit data UUENCODE and
UUDECODE was used. POP3 is
essential for dial-up connection to the
mail server (when IP address is usually
assigned dynamically).
SERVER
CLIENT
REMOTE CLIENT
ssaxena@me.com
domainmailbox
Domain gets translated
in to an IP address by
DNS
notes

16. Internet Mail Mime
‣ Multipurpose Internet Mail Extension
‣ Does not change SMTP
‣ Allows sending of
- Audio
- Video
- Image
- Application
- HTML

17. POP & IMAP
‣ POP
• Retrieve Messages
• Delete Messages
• Not for sending mail
‣ IMAP
• Retrieve Messages
• Delete Messages
• Organize Messages on server
• Add Messages
• Disconnected client can sync with server
• Not for sending messages

18. High Availability - An Introduction
‣ Eliminating
• Downtime
- Planned
- UnPlanned
• Single Point of Failure (SPOF)
• Fault Resilience
- Not fault tolerant
‣ Possible Strategies
• Hardware Level with OS Support
- HACMP of RS/6000
• Operating System Level
- Microsoft Cluster Service (MCS)
• Application level
- Domino

19. Domino Environment Basic Terminology
‣ Domino =Server
‣ Notes = Client
‣ Application = Database
‣ Database = Record
‣ Item = Field
‣ View = Record Set
‣ Form = UI with template with BI records
‣ Replication = optimised information dissemination
‣ Objects = AWT, SWING,...
‣ Mail = Another Special database
‣ Agent = Customer code, triggered against events

20. Domino Environment Components
‣ Domino Server
‣ Client
Client communicates over the Network with Domino Server;
System Administrator sets them up and manages it.
Lotus Domino lets people access,
track, share, and organize information
in several useful ways, even if they are
occasionally connected to a network.
It comprises of a set of databases that
reside along with an excellent
messaging infrastructure. Leveraging
the distributed storage & messaging
features, the integrated rapid
application development environment
provided by Domino/Domino enables
rapid application development &
deployment of strategic enterprise-
wide business applications.
Domino applications are nothing but
Domino databases. Domino databases
contain semi-structured records,
called documents. Domino comes with
many type of design elements which
are used to create a range of
applications. The Domino integrated
rapid development environment is the
single interface to all Domino
application design elements. However,
Domino is not a relational database.
This is a key distinction since Domino
does not provide capabilities usually
associated with RDBMS, like
referential integrity, real time access to
data, locking record or table. In fact,
Domino & RDMS are complementary.
Domino seamlessly integrates with
Internet and follow Internet standards
and open standards like servlets, JSP,
XML, SMTP, POP3/IMAP, etc.
notes

21. About Domino Server
‣ Stores database that end-users share
‣ Perform mail routing & delivery
‣ Replicates databases across servers
‣ Ensures database security
‣ Manages calendar information
‣ Runs additional server tasks
Domino server runs under a NOS such
as Microsoft NT, LINUX, etc. You
should try to avoid running file
services together with Notes server for
these reasons:
• Security may be compromised if
Notes data directories are
inadvertently shared;
• Performance of one service may
suffer because of other service;
• Stability of one service may be
affected by the other service.
notes

22. Domino Server Classification
‣ Mail Server (Domino and / or SMTP)
‣ Database/Application Server
‣ Passthru Server
‣ Hub Server
‣ Backup Server
‣ Gateway Server
‣ Search Server
‣ Clustered Server
‣ Partitioned Server
Mail servers store user mail
databases and route mail across the
network. Mail servers also maintain the
Free Time databases and process free
time queries for Calendar system.
Database/Application servers store
application databases such as
discussions, tracking, and online
documentation databases.
Passthru servers acts as a stepping
stone allowing user to connect to a
server without worrying for routing
steps required to make the
connections.
Hub servers are used to route mail &
replicate databases among other hub
servers or spoke machines.
Backup servers are used to store
database replicas that are critical to
users, which can be easily backed up
on tape instead of performing backup
on different servers.
Gateway servers connect to non-
Notes systems, for example fax.
Search servers that provide users
with the ability to perform searches
across all servers in a domain.
Clustered servers provide users with
constant access to data by giving
automated load-balancing and failover.
Partitioned servers run multiple
instances of the Domino server on a
single computer.
notes

23. About Notes Client
‣ Provide GUI to end-users
‣ Client/Server Operation
‣ Allow access to Domino Mail
‣ Lets end-user run Domino Applications
• Applications are Domino Databases
‣ Lets Designers develop Domino Applications
‣ Lets Administrator manage Domino Applications and
Servers
‣ Replicates changes from local copy to server

24. Notes Client Classification by Usage
‣ Mailing
‣ Collaboration
‣ Designer
‣ Administration

25. System Administrator Responsibilites
‣ Plan new Domino Systems and Upgrades
‣ Deploy Domino Systems
‣ Maintain databases, servers, clients, connections...
‣ Monitor Domino System Performance
‣ Perform ongoing Administrative tasks
‣ Manage Certification & Control Security
‣ Troubleshooting
Planning Domino System Topology -
connecting Notes servers physically &
logically to provide optimum
communication including mail routing
& replication. Organizational structure
- outlining a method for organizing &
naming servers & users. Calendar
System - set-up Notes scheduling
based on organization structure.
Security Policy - to prevent
unauthorized access of information.
Internet – SMTP Mailing & Application
Server planning, setup, and security
including integration with firewall/
reverse proxy
Supporting Notes End-user Notes,
System Administration, Application
Development training
End-user support Troubleshooting
server, network, mail routing,
replication problems
Developing Administrative
Processes Server Processes -
Naming convention, backup/restore
policy, standard configuration Support
Processes - In-house support &
problem escalation methods to Lotus
authorized support General Admin
Processes - User registration, adding
databases including resource
databases & their admin, centralized
vs. decentralized control, monitoring
servers & network, other regular admin
tasks
notes

26. How Domino Communicates
‣ Over LAN and/or WAN
‣ Intermittently through
• Dial-up Connection
• Remote LAN services
- Eg. Microsoft Remote RAS/DUN
• Combination of the two
‣ Notes Named Network (NNN)
Domino server and workstations are
connected over a network. Server-to-
Server and workstation-to-server can
be connected all the above methods.
You can even extend your Notes
Network to allow workstations and
servers to communicate with each
other over the Internet. This is very
useful to mobile users who visit places
where corporate network in not
present but Internet is available.
The Domino Server Setup program
automatically places all servers that
are in a Domino domain and that run
the same network protocol in the same
Notes named network (NNN). In the
Server document, the setup program
assigns each NNN a default name in
the format port name network.
notes
NNN is a group of servers that can connect to each other directly
through a common LAN protocol and network pathway.
Servers on the same NNN route mail to each another automatically,
whereas you need a Connection document to route mail between
servers on different NNNs.

27. Notes Named Networks Benefits
‣ Encourage users to access Servers that are close to them
‣ Simplifies Administrative Tasks
• Managing Replication
• Managing Mail Routing
One of the key reasons for NNN
creation based on physical/logical
grouping is to promote users to access
servers that are close/relevant to them
and to discourage accessing the
servers that are remote (and therefore
more expansive to access). This
happens, when a user chooses File -
Open Database, the list of servers
contains the servers of his NNN only.
The user has to explicitly mention the
server that is not there in his NNN.
Mail routing takes place automatically in
a NNN, without a requiring connection
document to determine a routing path.
For replication, a NNN can easily fit into
a hub-and-spoke topology, where all
the servers of a NNN are spokes of a
hub server.
notes

28. Factors Influencing Choice of NNNs’
‣ Servers in one location with a single protocol
‣ Servers in multiple location with a single protocol
• Cost of communication involved across locations
‣ Logical grouping of servers
‣ Servers that run more than one protocol
‣ Mail routing and replication issues
Some ideas for deciding the NNNs:
Based on departments/division/
locations within your organization that
need to communicate frequently should
be in same NNN to enable faster mail
routing.
Based on communication costs to
discourage users accessing the servers
without explicit need and to schedule
mail routing at off-peak hours.
Mail routing is a resource intensive task,
therefore it is recommended to have a
relatively large server designated as
mail server in each NNN. Servers
running multiple protocols may be part
of several NNNs based on connection
type and communication costs. This is
required for mail routing & replication.
notes

29. Domino Domain Definition
‣ Organization of Servers for
• Administrative Boundary
• Security Boundary
• Unit of Mail Topology
• Unit of Replication Topology
‣ Can be of varying sizes
• Numbers of servers/users
A Domino domain is a group of Domino
servers that share the same Domino
Directory that is the control and
administration center for Domino
servers in a domain. The Domino
Directory contains, among other
documents, a Server document for
each server and a Person document for
each Notes user.
notes

30. Domino Directory Definition
‣ Stores information about the domain
• Users, Servers, Groups...
• Administration & Control of the domain
- Replication & Mailing thru ‘connection doc’
- Scheduled server tasks
‣ Contains documents for
• Certificates, Config settings, Connection, Domain,
Group, Person, Program, Resource, Server location..
The Domino Directory (earlier referred to
as the Public Address Book or Name
and Address Book) is a database that
Domino creates automatically on every
server. The Domino Directory is a
directory of information about users,
servers, and groups, as well as custom
entries you may add. Registering users
and servers in a domain automatically
creates corresponding Person
documents and Server documents in
the Domino Directory for the domain.
These documents contain detailed
information about each user and server.
The Domino Directory is also a tool that
administrators use to manage the
Domino system. For example,
administrators create documents in the
Domino Directory to connect servers for
replication or mail routing, to schedule
server tasks, and so on. When a server
runs the LDAP service, the Domino
Directory is accessible through the
Lightweight Directory Access Protocol
(LDAP). Typically, a Domino Directory is
associated with a Domino domain.
When you set up the first server in a
Domino domain, Domino automatically
creates the Domino Directory database
and gives it the file name NAMES.NSF.
When you add a new server to the
domain, Domino automatically creates a
replica of the Domino Directory on the
new server. You can also create a
Domino Directory manually from the
PUBNAMES.NTF template and use it as
a secondary directory to store, for
example, entries for your Internet users.
notes

31. Domino Directory Additional Services
‣ Directory Catalog
• Consolidate key info from Domino Directory(s) in to
small/light-weight DB
• Mobile Directory Catalog
• Directory Assistance
- Manage name lookups from multiple Domino and/or
third party LDAP directories
• LDAP Service
- LDAP V3 complaint server
Directory catalog is an optional
directory database that typically
contains information aggregated from
multiple Domino Directories. Clients and
servers can use a directory catalog to
look up mail addresses and other
information about the people, groups,
mail-in databases, and resources
throughout an organization, regardless
of the number of Domino domains and
Domino Directories the organization
uses. A directory catalog includes the
type of information that is important for
directory services, and excludes other
types of information that are part of a
Domino Directory, for example Domino
configuration information, such as
information in Connection documents.
Directory assistance is a feature a
server can use to look up information in
a directory other than a local primary
Domino Directory (I.e. NAMES.NSF).
You can configure directory assistance
to use a particular directory for services
like Client authentication, Group
lookups for database authorization,
Notes mail addressing, and LDAP
service searches or referrals. A Domino
directory is a directory created form the
PUBNAMES.NTF template and
accessed via NAMELookup calls.
Servers can use directory assistance to
do lookups in either local or remote
replicas of a Domino directory.
notes

32. Additional Services Comparison

33. Notes IDs Definition
‣ Unique binary file that identifies a legitimate Domino user
or server and contains:
• Name of the ID owner
• Domino ID number
• A Public key & a Private key
• One or more encryption keys (optional)
• A password (recommended)
• One or more certificate License type
Name of the ID owner identifies the user
or server by name. Notes ID number
identifies a user as having legitimate
use of Notes. The ID number is
permanently associated with the User
ID and cannot be changed. A public key
and a private key a string of numbers
used during authentication and to
decrypt mail messages. Notes also
stores a copy of each user's public key
in the Public Address Book. Encryption
keys a string of numbers used to
encrypt and decrypt fields in a
document. Users distribute these keys
to other users to ensure that only
intended recipients can read a
document. Password an optional
security feature to protect the ID from
unauthorized use. Certificates a
certificate, issued by a certifier, that
verifies the association between the
name of a given user, server, or another
Notes certifier and its associated public
key. A Notes server or user ID can have
one or more certificates. The way that
flat IDs and hierarchical IDs collect
certificates is very different. License
type identifies a user as having
legitimate use of Notes.
notes

34. Notes ID - More Details
‣ Classification
• User ID
• Server ID
• Certifier ID
‣ Naming Conventions
• Domain name should be a single word containing up to
31 characters. Do not use period (.) in a domain name.
• Organization name is the name of Certifier ID and is
appended to all users & server names.The name can be
up to 64 characters. Usually the organization name is
same as the domain name, and there is only one
organization in a domain.
• NNN name can be up to 31 characters.
• Server names can be up to 79 characters. It can have
any character except “(“, ”)”, ”@”, ”/”, ””, ”=“, “+”.
Choose a name you want to keep.
Changing a server name involves
recertifying the server ID and changing
the name in the Server document,
Group documents, ACLs, and
Connection documents. Choose a
name without a space. When you use
server console commands, you must
use quotation marks around a server
name containing spaces. Keep in mind
that replication and mail routing tasks
are usually performed based on
numeric rather than alphabetical order.
For example, in the case where the
router is faced with multiple choices for
a routing path, Notes routes mail to the
server 01Finance before routing to the
server Accounting, and it routes to
Accounting before routing to the server
Research. A server name can contain
up to 79 characters, but in certain
networks the first several characters
must be unique in order for the network
to identify the server. With NetBIOS, the
first 15 characters must be unique; with
AppleTalk, the first 32 must be unique;
and with SPX, the first 47 must be
unique.
notes

35. Connecting Domino Servers
‣ Key step in Domino System planning/ deployment;
required for
• mail routing
• replication
• calendar system
‣ Define application level topology
An important part of planning a Notes
deployment is deciding how to arrange
interconnections of servers and
workstations to achieve the most
effective use of Notes in your
organization. At this point, you should
not confuse with layer 1 or layer 2
topology or interconnection schemes.
Here, the attempt is to define the
application level topology.
notes

36. Domino Topology Classification
‣ Hub and Spoke
‣ Binary Tree
‣ Peer-to-peer
Hub-and-spoke A central server,
known as the hub, replicates with
spoke servers in turn. This topology is
common in large sites and is the most
adaptable for system growth and
change. Binary tree One server
replicates with two servers at a lower
level, and those two replicate with two
servers each, and so on, until
replication is complete. Tree topology is
an advantage in international
organizations where distances between
locations and local country issues are a
consideration. Peer-to-peer Each
server replicates directly with other
servers. This topology is best reserved
for small organizations that have only a
few servers. It is the most limited in
terms of adapting to system growth and
change.
notes

37. Hub and Spoke Topology
Following are some of the advantages
of hub-and-spoke topology: Connects
many Domino servers in an efficient
manner. Allows centralized Public
Address Book administration, because
the access control list of the Public
Address Book lists the hub as manager
and the spokes as readers, requiring
only a one­way connection (the hub
calls the spokes). Facilitates mail
routing and database replication across
multiple LANs and over WANs. For
example, if your organization uses more
than one protocol, you can install
multiple protocols on the hub servers so
that users running different protocols
have a way of communicating with each
other. Most intra­domain transactions
on the LAN are a maximum of two hops
away, for example, server to hub to
server. Mail routing is peer-to-peer in
the same domain, and all mail servers in
this configuration are only one hop
away. A hub can be used to bridge two
networks running different protocols if
the hub server runs both protocols.
Can be designated as mail hubs or
replication hubs. Mail­only hubs can be
used to route mail to different domains
or gateway servers while replication
hubs can perform scheduled
replications. Following are some
disadvantages of a hub-and-spoke
sequence: Network traffic increases on
the LAN segment to which the hub is
attached. If you have too many servers
(more than 25 servers per hub), you
might need to establish tiers of hubs,
which could require several dedicated
servers. In the event of a hub failure, all
replication is disabled until the hub is
replaced or repaired.notes

38. Binary Tree Topology
Binary tree topology arranges servers in
a pyramid configuration where one
server replicates with two servers on the
next level down, and those two
replicate with two more, and so on.
Servers at the top of the pyramid
replicate with each other after they have
finished replicating with the servers
beneath them. Because of the time
required for information to travel from
the top of the pyramid to the bottom,
this topology is generally less efficient
than hub-and-spoke. Binary tree
topology works well in international
organizations where distances between
locations and local country issues are a
consideration.
notes

39. Domino Policies
‣ Registration
‣ Desktop
‣ Mail
‣ Setup
‣ Security
‣ Mail Archiving
Registration settings set default user
registration values including user
password, Internet address format,
roaming user designation, and mail.
Desktop settings update the user's
desktop environment or reinforce
setup policy settings.
Mail settings set and enforce client
settings and preferences for mail and
for Calendaring and Scheduling.
Setup settings are used during the
initial Notes client setup to populate
the user's Location document. Setup
settings include Internet browser and
proxy settings, applet security
settings, and desktop and user
preferences.
Security settings define administration
ECLs and password-management
options, including the synchronization
of Internet and Notes passwords.
Archive settings control mail archiving.
Archive settings control where
archiving is performed and specify
archive criteria.
notes