Determine the round trip time, Computer Network Security

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QUESTION

a) Determine the RTT (round trip time) between a client requesting a web page of 1024 bytes in size from an internal web server on a 100 Base-T Ethernet. Consider a one-way propagation delay of 10 µs and that the request and header response messages are of negligible size and all other delays are zero.

b) The ASN.1 specification language is an integral part of the OSI Reference Model architecture, and is used in some protocols on the Internet. ASN.1 data objects are encoded for transmission using the Basic Encoding Rules (BER). Give a illustration of a transmitted byte-stream by using the subsequent module of data type declarations and its corresponding instances:

title ::= OCTET STRING, year ::= INTEGER, hit ::= BOOLEAN

{title, "Gladiator"}, {year, 2000}, {hit, "1"}

c) Give the format of a typical get message and a trap message under SNMPv1.

d)

i) Show the structure of a typical Frame Relay frame and describe the role of each field in the frame.

ii) Describe the purpose of the DLCI field in the address segment of a Frame Relay frame. How big is this field generally?

iii) What is the purpose of the DSU or CSU in a Frame Relay network?


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