23. Here’s a trust relationship between a customer, his bank and his credit card company. When he drops a cheque at his bank to pay-off his credit card bill, he is assured that his credit card will be paid.
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28. Carries Bobs Distinguished Name (DN) and his Public Key with other details. CA will do a lot of physical validations and issue a certificate to Bob. Normally Bob gets that either through email or CA requests him to download it from their web site.
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30. You can store the certificate on your file system as a file (.cer), right click and check the properties. You can check the CAs and trusted parties certificates installed on your browser. Internet Explorer > Tools > Internet Options > Content > Certificates (button)