Question

1. To which of the following subnets does IP address 225.3.2.22 belong?

		225.3.2.0/24
		225.3.2.22/24
		225.2.3.0/24
		225.0.0.0/24
		none of the above

Question 2

On which of the following devices does the transport layer NOT run?

		laptop
		router
		cellphone
		A, B and C
		none of the above

Question 3

What is the source address contained in the discover message sent by a host that is wanting to obtain an IP address?

		255.255.255.255
		0.0.0.0
		the IP address of the server
		the last IP address that the host used.
		none of the above

Question 4

Which of the following is MOST TRUE regarding routing?

		It determines the end to end path that a packet takes from source to destination
		It is a network wide process
		The timescale it longer than that of forwarding
		A, B and C
		None of the above

Question 5

With reference to the DHCP protocol, which of the following messages will be sent by a DHCP server with details of a proposed IP address that the host can use?

		Discover message
		Offer message
		Request message
		Acknowledgement message
		None of the above

Question 6

Suppose datagrams are limited to 1500 bytes (including the header). Assume each header is 20 bytes. How many datagrams are needed to send a file of 5 megabytes?

		3333
		3334
		3379
		3425
		none of the above

Question 7

Two packets arrive at input port 1 and input port 2 at exactly the same time and need to be forwarded to output port 9 and output port 10 respectively. Assuming no other packets are in the router, which of the following is TRUE?

		The two packets can travel through the switch fabric at the same time when the fabric uses a shared bus for switching.
		The two packets can travel through the switch fabric at the same time when the fabric uses memory for switching.
		The two packets can travel through the switch fabric at the same time when the fabric uses a crossbar for switching.
		A, B and C
		none of the above

Question 8

Which of the following functions does a routers import port perform?

		Provides termination of the physical link
		Forwards controls packets to the routing processor
		Forwards packets to the correct output link
		A, B and C
		none of the above

Question 9

In which DHCP message is the yiaddr value equal to 0.0.0.0

		Discover message
		Offer message
		Request message
		Acknowledgement message
		None of the above

Question 10

What advantage does switching via an interconnection network have over switching via memory or a shared bus?

		It is always faster
		It can forward multiple packets in parallel
		It can forward multiple packets to the same output port at the same time
		A, B and C
		none of the above

Question 11

A datagram of 5000 bytes arrives at a router and must be forwarded to a link with a MTU of 1500 bytes. The original datagram has a header of 20 bytes, with a 16 bit source IP address of 11111111 00000000 and an identification number of 1. What will be the source IP address of each segment?

Question 12

A datagram of 5000 bytes arrives at a router and must be forwarded to a link with a MTU of 1500 bytes. The original datagram has a header of 20 bytes, with a 16 bit source IP address of 11111111 00000000 and an identification number of 1. E) What header item is used to ensure fragments are assembled in the correct sequence

Question 13

Assume the forwarding table below exists at the input port. Using the longest prefix matching rule, identify the output link interface to which the following packet will be directed:Packet with destination IP address: 11110001 00011111 00111101 01110101

Prefix	Link Interface
11110000 00011111 001111	0
11110000 00011111 001111010	1
11110000 00011111 0010	2
Else	3

Question 14

A datagram network uses 32-bit host addressing. Router X has 4 links, link 0, link 1, link 2 and link 3. Packets are forwarded to links as shown below. Provide the prefix that would exist in a forwarding table that could be used to forward packets to link 1 interface. Note: longest prefix matching is used.

Start destination address range	End Destination address range	Link Interface
11100000 00000000 00000000 00000000	11100000 00000000 11111111 11111111	0
11100000 00000001 00000000 00000000	11100000 00000001 11111111 11111111	1
11100000 00000010 00000000 00000000	11100001 11111111 11111111 11111111	2
Others		3

Question 15

A datagram network uses 32-bit host addressing. Router X has 4 links, link 0, link 1, link 2 and link 3. Packets are forwarded to links as shown below. Provide the prefix that would exist in a forwarding table that could be used to forward packets to link 0 interface. Note: longest prefix matching is used.

Start destination address range	End Destination address range	Link Interface
11100000 00000000 00000000 00000000	11100000 00000000 11111111 11111111	0
11100000 00000001 00000000 00000000	11100000 00000001 11111111 11111111	1
11100000 00000010 00000000 00000000	11100001 11111111 11111111 11111111	2
Others		3

Answer 1

As per Chegg answering guidelines, I'm answering only the first 4 parts:-

QUESTION 1:

Actually the IP 225.3.2.22 belongs to both the subnets 225.3.2.0/24 and 225.3.2.22/24 as the first 24 bits of the network id are the same. Furthermore, the subnets 225.3.2.0/24 and 225.3.2.22/24 are the same subnets but they are represented in CIDR format by different IPs. But generally, the host id part is kept as 0 to represent a network. So, the answer is 225.3.2.0/24.

QUESTION 2:

The transport layer will not work on a router because in router we only have three layers i.e, physical layer, data link layer, and network layer.

QUESTION 3:

The source IP will be 0.0.0.0 because the host does not have an IP address till now and it indicates that the source does not have an IP address and needs one.

QUESTION 4:

A, B & C all are correct in the case of routing.