1. Which of the following is NOT a major performance metric of the network layer?
A) Delay
B) Jitter
C) Reliability
D) Encapsulation
Answer: D) Encapsulation
2. What factor contributes to network throughput?
A) The number of packets successfully delivered per second
B) The total number of routers in the network
C) The size of the physical medium
D) The number of lost packets in a network
Answer: A) The number of packets successfully delivered per second
3. Propagation delay in a network is dependent on:
A) The processing speed of a router
B) The distance between sender and receiver
C) The packet header size
D) The type of encryption used
Answer: B) The distance between sender and receiver
4. Which type of delay occurs due to buffering and processing at intermediate devices?
A) Transmission delay
B) Queuing delay
C) Propagation delay
D) Jitter delay
Answer: B) Queuing delay
5. Which factor does NOT contribute to transmission delay?
A) Packet size
B) Link bandwidth
C) Distance between sender and receiver
D) Data rate of the link
Answer: C) Distance between sender and receiver
6. What is jitter in network communication?
A) The variation in packet delay
B) The total time a packet takes to reach the destination
C) The number of lost packets
D) The time taken for encryption and decryption
Answer: A) The variation in packet delay
7. A network is considered congested when:
A) Too many packets arrive at a router beyond its processing capacity
B) The bandwidth of a link is unlimited
C) The delay is constant throughout the network
D) The number of routers in the network is reduced
Answer: A) Too many packets arrive at a router beyond its processing capacity
8. How does congestion control improve network performance?
A) By reducing the number of packets lost due to congestion
B) By increasing packet queuing at routers
C) By reducing the processing speed of routers
D) By increasing propagation delay
Answer: A) By reducing the number of packets lost due to congestion
9. Which of the following routing algorithms can improve network performance by
selecting the shortest path?
A) Distance Vector Routing
B) Static Routing
C) Flooding
D) Reverse Path Forwarding
Answer: A) Distance Vector Routing
10. What is the main purpose of Quality of Service (QoS) in the network layer?
A) To prioritize and manage network traffic efficiently
B) To increase the number of routers in a network
C) To randomly distribute packets across all available paths
D) To ignore congestion and maximize packet transmission
Answer: A) To prioritize and manage network traffic efficiently