NSCT – Network Layer MCQs
Q#1: Which layer of the OSI model is responsible for routing packets between networks?
(A) Data Link Layer
(B) Network Layer
(C) Transport Layer
(D) Application Layer
Answer: (B) Network Layer
Q#2: The Network Layer is which layer in the OSI model?
(A) First Layer
(B) Second Layer
(C) Third Layer
(D) Fourth Layer
Answer: (C) Third Layer
Q#3: Which addressing is used in the Network Layer?
(A) MAC Address
(B) IP Address
(C) Port Address
(D) Physical Address
Answer: (B) IP Address
Q#4: Which device primarily operates at the Network Layer?
(A) Hub
(B) Switch
(C) Router
(D) Repeater
Answer: (C) Router
Q#5: Data at the Network Layer is called:
(A) Bit
(B) Frame
(C) Packet
(D) Segment
Answer: (C) Packet
Q#6: Which protocol works at the Network Layer?
(A) HTTP
(B) IP
(C) FTP
(D) SMTP
Answer: (B) IP
Q#7: The main function of the Network Layer is:
(A) Framing
(B) Routing
(C) Flow control
(D) Encryption
Answer: (B) Routing
Q#8: Which protocol is used for sending error messages in networks?
(A) FTP
(B) ICMP
(C) HTTP
(D) SMTP
Answer: (B) ICMP
Q#9: Which protocol maps IP addresses to MAC addresses?
(A) ARP
(B) FTP
(C) TCP
(D) DNS
Answer: (A) ARP
Q#10: The process of selecting the best path for data is called:
(A) Routing
(B) Switching
(C) Multiplexing
(D) Encoding
Answer: (A) Routing
Q#11: Which protocol translates domain names to IP addresses?
(A) HTTP
(B) DNS
(C) FTP
(D) SMTP
Answer: (B) DNS
Q#12: IPv4 addresses are how many bits long?
(A) 16 bits
(B) 32 bits
(C) 64 bits
(D) 128 bits
Answer: (B) 32 bits
Q#13: IPv6 addresses are how many bits long?
(A) 32 bits
(B) 64 bits
(C) 128 bits
(D) 256 bits
Answer: (C) 128 bits
Q#14: Which field in the IP header limits the lifetime of a packet?
(A) TTL
(B) Port
(C) MAC
(D) CRC
Answer: (A) TTL
Q#15: Which addressing method identifies a network and host?
(A) IP Address
(B) MAC Address
(C) Port Address
(D) Physical Address
Answer: (A) IP Address
Q#16: Which protocol helps report network errors?
(A) ICMP
(B) FTP
(C) SMTP
(D) HTTP
Answer: (A) ICMP
Q#17: The Network Layer provides:
(A) End-to-end communication
(B) Logical addressing
(C) File transfer
(D) Data encryption
Answer: (B) Logical addressing
Q#18: Which algorithm is commonly used for routing?
(A) Dijkstra Algorithm
(B) Bubble Sort
(C) Binary Search
(D) Linear Search
Answer: (A) Dijkstra Algorithm
Q#19: Fragmentation of packets occurs at which layer?
(A) Data Link Layer
(B) Network Layer
(C) Transport Layer
(D) Session Layer
Answer: (B) Network Layer
Q#20: The main purpose of the Network Layer is:
(A) Reliable node-to-node delivery
(B) Path determination and packet forwarding
(C) Application services
(D) Data presentation
Answer: (B) Path determination and packet forwarding
If you want, I can also prepare 20 MCQs for Transport Layer, 20 for Data Link Layer, and 20 for Physical Layer in the same format so you have a full OSI model MCQ set.
Do you want me to do that next?