1. NATIONAL INSTITUTE OF BUSINESS MANAGEMENT
Diploma in Computer Networks 17.2F
Connecting Networks DCN-3-3-13
The exam has Two (Part A and Part B) Parts. Answer for all parts.
Calculators are not allowed.
Date:15-02-2019 | Time:0900-1200 Duration:3 Hours
Part A
Answer all questions. All questions carry equal marks.
1. Which statement describes the physical topology for a LAN?
a) It depicts the addressing scheme that is employed in the LAN.
b) It describes whether the LAN is a broadcast or token-passing network.
c) It defines how hosts and network devices connect to the LAN.
d) It shows the order in which hosts access the network.
2.Which feature sends simulated data across the network and measures performance
between multiple network locations?
a) LLDP
b) IP SLA
c) syslog
d) SPAN
3. What is a disadvantage of leased lines?
a) low quality
b) inconsistent availability
c) complexity
d) high cost
4.Which PPP protocol allows a device to specify an IP address for routing over the PPP
link?
a) PAP
b) CHAP
c) LCP
d) IPCP
5. PPP authentication is performed at which OSI layer?
a) Layer 1
b) Layer 2
c) Layer 3
d) Layer 4
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6. Which additional functionality is available on an interface when the encapsulation is
changed from HDLC to PPP?
a) Flow control
c) Authentication
b) error control
d) synchronous communication
7. What are the two types of VPN connections? (Choose two.)
a) PPPoE
b) site-to-site
c) leased line
d) Frame Relay
e) remote access
8.Which two components are needed to provide a DSL connection to a SOHO? (Choose
two.)
a) transceiver
b) DSLAM
c) CMTS
d) CM
e) PPPoE enabled switch
9. What is an advantage offered by GRE tunnels?
a) built in security mechanisms
b) encryption of encapsulated traffic
c) support for IP multicast tunneling
d) support for connecting individual hosts across the Internet
10. What TCP port is used by BGP to exchange messages between routers?
a) 22
b) 58
c) 179
d) 443
11.Which troubleshooting tool can be used to pinpoint the distance to a break in a network
cable?
a) digital multimeter
b) network analyzer
c) network analysis module
d) cable tester
12.What range of IP addresses is represented by the network and wildcard mask
192.168.70.0 0.0.0.127?
a) 192.168.70.0 to 192.168.70.127
b) 192.168.70.0 to 192.168.70.255
c) 192.168.70.0 to 192.168.70.63
d) 192.168.70.0 to 192.168.71.255
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13. What is the only type of ACL available for IPv6?
a) named standard
b) named extended
c) numbered standard
d) numbered extended
14.An administrator has configured an access list on R1 to allow SSH administrative access
from host 172.16.1.100. Which command correctly applies the ACL?
a) R1(config-if)# ip access-group 1 in
b) R1(config-if)# ip access-group 1 out
c) R1(config-line)# access-class 1 in
d) R1(config-line)# access-class 1 out
15. Which mode is used to configure SNMP?
a) privileged mode
b) global configuration mode
c) interface configuration mode
d) router configuration mode
16. What is an SNMP management agent?
a) a computer loaded with management software and used by an administrator to
monitor a network
b) a database that a device keeps about network performance
c) software that is installed on devices managed by SNMP
d) a communication protocol that is used by SNMP
17.What mitigation plan is best for thwarting a DoS attack that is creating a switch buffer
overflow?
a) Disable DTP.
b) Disable STP.
c) Enable port security.
d) Place unused ports in an unused VLAN.
18.An attack has been launched within a company and a host name has been identified as
the source. What command can a network technician use to determine the IP address
assigned to the host name?
a) ipconfig /all
b) net computer
c) nslookup
d) tracert
19.Which type of traffic does Cisco recommend be placed in the strict priority queue (PQ)
when low latency queuing (LLQ) is being used?
a) video
b) data
c) voice
d) management
4. 20.Which two WAN infrastructure services are examples of private connections? (Choose
two.)
a) T1/E1
b) wireless
c) DSL
d) cable
e) Frame Relay
Part B
Answer All questions.
The marks given in brackets are indicative of the weight given to each part of the
question
B1. A WAN operates beyond the geographic scope of a LAN.
a) What is the difference between LAN and WAN? (4 marks)
b) List 3 Common WAN topologies with the diagrams? (6 marks)
c) Identify and briefly describe below WAN Terms using diagram? (10 marks)
CPE
DCE
DTE
Demarcation Point
Local Loop
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B2. This question is about the Network Security and Monitoring
a) The SNMP system consists of three elements. List that 3 elements? (3 marks)
b) What are the ports numbers that used by SNMP? (2 marks)
c) Write down two different between SNMPv2c and SNMPv3? (4 marks)
d) Write down two mitigation technology from basic VLAN attacks? (4 marks)
e) What is the advantage over Switched Port Analyzer (SPAN) feature? (3 marks)
f) Briefly describe below DHCP attacks types? (4 marks)
a) DHCP spoofing attack
b) DHCP starvation attack
B3 This question is about the ACL and Networking Trends.
a) What is ACL Packet Filtering? (4 marks)
b) Briefly describe the below ACL Statements? Specify the ACL type. (6 marks)
1) Router(config)#access-list 105 permit tcp 192.168.20.0 0.0.0.255 any eq 23
2) Router(config-std-nacl)#permit host 192.168.10.10
Router(config-std-nacl)#permit 192.168.50.0 0.0.0.255
c) Cloud computing involves large numbers of computers connected through a
network that can be physically located anywhere. There are three main cloud
computing services. List that (6 marks)
d) What are the advantages of Virtualization? (4 marks)
