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Question (a) Consider that you enter the subsequent URL in the address bar of a popular web client and that both the server and client accepts HTTP version 1.1.
i. What can be the initial request made by the client?
ii. Describe how HTTP version 1.1 allows 'surfing' experience to be greatly improved.
iii. Provide a sample HTTP request message with at least 4 main header lines that is sent by the web client.
iv. Consider that the web resource is actually found on the server, give at least 3 header lines that you can expect in the sample response HTTP message.
Question (b) Integrity and Authentication are two important network security services.
i. Describe what you understand by authentication.
ii. Give one mechanism that will be used to enforce both authentication and data integrity and illustrate briefly how it works.
iii. Explain one mechanism that you can use to ensure data integrity alone during transmission.
TCP and UDP End-to-end delivery application is connection less. The basic function of connectionless service are as given: It adds extension of LAN abstraction. It has simp
(a) Describe DES encryption with a block diagram and brief steps. (b) How does triple DES improve security. What is the effective key length of triple DES? How can 3DES be compa
on LAN,where are IP datagrams transported?
An overall rise in mobility, coupled with the falling cost of Wi-Fi equipment, has led to a proliferation of Wi-Fi hot spots in public areas to provide Internet accessibility. Thus
Digital Signatures Digital Signatures are encrypted messages which can be proven mathematically to be authentic. These are created in response to rising requirement to verify in
ENCAPSULATION Network interface layer adds IP datagram as data area in hardware frame. Hardware ignores IP datagram message format. Standards for encapsulation defines details
Gateways They transfer packets among network machines that have different protocols (e.g. between a WAN and a LAN). They access a packet formatted for one protocol and change
Q. Explain the random key distribution? The triple key management mechanisms ensure a better and complete security solution using the random key distribution mechanism. In this
(a) Describe how CSMA/CD operates and explain how Ethernet deals with collisions. (b) Describe how the subsequent protocols work: i. ARP ii. DHCP iii. DNS iv. SMTP (c) The
QUESTION : a) A datagram of 3000 bytes has to travel over a network with a MTU size of 1000 bytes. Describe how fragmentation can be used to solve this problem. You should pr
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