Networking Assignment – COMPLETE SOLUTION

MAC sublayer receives data of 3500 bytes from the LLC sublayer_mini

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Instructions :
Please note that you may provide only the final answer in computational questions.  However, if the answer is incorrect (even a typo error) then you will receive zero marks. Therefore it is better that you show all of your working and steps in your calculations.

Question 1:

Identify the appropriate layer in the TCP/IP protocol suite where the following are found:

  1. Signals on the telephone line
  2. Sequencing of segments
  3. Data encapsulation with a trailer
  4. A graphic file

Question 2:

  1. Convert the following IP address to binary notation:

72.231.204.126

  1. Change the following IP address in binary notation to dotted decimal notation:

01011010 00010111 10011011 00100000

  1. Convert the following IP address in hexadecimal notation to binary notation:

0x1C2B3A409

  1. Convert the following IP address to hexadecimal notation:

68.101.3.97

Question 3:

If the Ethernet MAC sublayer receives data of 3500 bytes from the LLC sublayer,

  1. How many frames are produced?
  2. What is the size of the data in each of frames?

Question 4:

An organisation was granted a network address block where 202.15.172.198 is one of the addresses in this block.

  1. Find the class of this address block.
  2. Find the number of assignable host addresses in this block.
  3. Find the network address.
  4. Find the direct broadcast address.

Question 5:

An organisation was allocated a network address block. One of the addresses in this block is 98.76.54.32/22.

  1. Find the number of addresses in this block.
  2. Find the number of assignable host addresses.
  3. Find the first address in this block.
  4. Find the last address in this block.

Question 6:

An organisation is granted the address block 132.97.10.0/24. The organisation needs 4 subnetworks, each with 62 host addresses.

  1. Find the first address of each subblock.
  2. Find the last address of each subblock.

Question 7:

An organisation has been allocated the address block 72.14.12.0/22. The organisation needs two subnets where:

  1. The first subblock has at least 120 assignable addresses, and
  2. The second subblock has at least 60 assignable addresses.

Note: In creating the two subnets from the given address block, use the smallest address values when you specify the two subblocks.

Question 8:

A Wireshark capture of an Ethernet frame contains the following encapsulated data:

45 00 05 DC 4F FF 40 00 29 06 01 4E 7A 59 DC 33 14 8A 04 06 08 00 4D 34 .. .. ..

The contents of the packet is given in hexadecimal. Note that the trailing data portion of the packet has been omitted.

Examine the packet header given above, and identify the following:

  1. The version of the IP protocol.
  2. The size of the IP header in bytes (i.e. octets).
  3. The total length of this packet in bytes (i.e. octets).
  4. The higher level protocol that uses this packet.
  5. Is this packet part of a fragment? If so, give reasons and specify the fragment offset. If not, give reasons and specify the size of the data length in bytes (octets).

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