Network Layer And Transport Layer Protocols Practice Exam Practice Tests

Question 1

A client sends a UDP datagram of 1500 bytes (including header) to a server. The IP header is 20 bytes and the UDP header is 8 bytes. What is the size of the data payload?

Accepted Answer

1472 bytes

Answer

1480 bytes

Answer

1492 bytes

Answer

1500 bytes

Question 2

TCP guarantees that data will arrive in the same order it was sent, while UDP does not.

Accepted Answer

True

Answer

False

Question 3

A TCP connection experiences a round-trip time (RTT) of 50 ms. If the sender's window size is 65535 bytes, what is the maximum throughput (in Mbps) the connection can achieve, assuming no packet loss?

Accepted Answer

10.4856 Mbps

Answer

5.2428 Mbps

Answer

20.9712 Mbps

Answer

26.2144 Mbps

Question 4

Which of the following are characteristics of UDP?

Answer

Connection-oriented

Answer

Connectionless

Answer

Reliable

Answer

Unreliable

Answer

High overhead

Answer

Low overhead

Question 5

A TCP sender transmits a segment with sequence number 1000 and 100 bytes of data. What acknowledgment number should the receiver send back to acknowledge this segment?

Accepted Answer

1100

Question 6

During the TCP three-way handshake, which of the following flags are set in the first segment sent by the client?

Accepted Answer

SYN

Answer

ACK

Answer

FIN

Answer

RST

Question 7

Consider a network where router A uses the Bellman-Ford equation to update its distance vector. Router A receives a distance vector from neighbor B, where B's distance to destination C is 5, and the cost from A to B is 2. According to the Bellman-Ford equation, what is A's updated estimate of the distance to C via B, represented as $D_A(C)$?

Accepted Answer

7

Answer

3

Answer

10

Answer

2.5

Question 8

Given a network topology where router X has direct links to routers Y and Z. The cost of the link X-Y is 3, and the cost of the link X-Z is 5. Router Y's least cost to destination D is 2, and Router Z's least cost to destination D is 4. Using the Bellman-Ford equation, calculate the estimated least cost from router X to destination D.

Accepted Answer

5

Question 9

In link-state routing, what is the primary purpose of flooding the network with Link-State Packets (LSPs)?

Accepted Answer

To distribute information about a router's neighbors and link costs to all other routers.

Answer

To establish a direct connection between two routers.

Answer

To request routing information from neighboring routers.

Answer

To prevent routing loops.

Question 10

Dijkstra's algorithm, used in link-state routing, guarantees to find the least-cost path from a source router to all other routers in the network, assuming non-negative link costs.

Accepted Answer

True

Answer

False

Question 11

Which of the following are advantages of link-state routing compared to distance-vector routing?

Answer

Simpler implementation

Answer

Faster convergence

Answer

Lower memory requirements

Answer

Avoids the count-to-infinity problem

Question 12

Given a network topology, describe the steps to derive a forwarding table for a specific router once the least-cost tree has been constructed.

Accepted Answer

For each destination in the network, identify the first hop on the least-cost path from the router to that destination. The destination and corresponding first hop are then entered into the forwarding table.

Question 13

Consider a network where router A has calculated the least-cost tree. The path from A to destination D goes through router B. What information will router A store in its forwarding table regarding destination D?

Accepted Answer

The next hop to reach D is B.

Answer

The cost to reach D.

Answer

The entire path from A to D.

Answer

The distance vector to D.

Question 14

An IPv6 address is represented as 8 groups of hexadecimal numbers separated by colons. Given the IPv6 address `2001:0db8:85a3:0000:0000:8a2e:0370:7334`, simplify it using IPv6 abbreviation rules. Provide the most abbreviated form.

Accepted Answer

2001:db8:85a3::8a2e:370:7334

Question 15

In IPv6 addressing, which type of address is used for one-to-nearest communication, where a packet is delivered to the nearest member of a group?

Accepted Answer

B. Anycast

Answer

A. Unicast

Answer

C. Multicast

Answer

D. Broadcast

Question 16

The global unicast address block in IPv6 is identified by the prefix 2000::/3, and it is divided into global routing prefix, subnet identifier, and interface identifier. If the global routing prefix is 48 bits and the subnet identifier is 16 bits, then the interface identifier is 64 bits.

Accepted Answer

True

Answer

False

Question 17

An Ethernet MAC address is `00-1A-2B-3C-4D-5E`. Calculate the corresponding IPv6 interface identifier. Show the result in hexadecimal format.

Accepted Answer

02-1A-2B-FF-FE-3C-4D-5E

Question 18

An IPv4 packet with a total length of 1500 bytes and an IHL value of 5 arrives at a router. What is the size, in bytes, of the data portion of the packet?

Accepted Answer

1480

Answer

1492

Answer

1472

Answer

1500

Question 19

An IPv4 packet has a total length of 1200 bytes and a header length of 20 bytes. It needs to be fragmented to fit an MTU of 500 bytes. Calculate the size (in bytes) of the second fragment's data payload.

Accepted Answer

480

Question 20

In IPv6, routers are allowed to fragment packets if the packet size exceeds the MTU of the outgoing link.

Accepted Answer

True

Answer

False

Network Layer And Transport Layer Protocols Practice Exam Practice Tests

Practice Tests

Network Layer and Transport Layer Protocols Practice Exam

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