BSCS : Network Fundamentals 2

Question 1

Which layer of the OSI model is responsible for logical addressing and routing packets across networks?

Accepted Answer

Network Layer

Answer

The Network Layer (Layer 3) handles logical addressing (IP addresses) and determines the best path for routing packets between networks.

Question 2

What is the subnet mask for a /26 CIDR block?

Accepted Answer

255.255.255.192

Answer

A /26 prefix means 26 bits are used for the network portion, leaving 6 bits for hosts, giving a subnet mask of 255.255.255.192.

Question 3

Which protocol uses a three-way handshake to establish a connection before data transfer?

Accepted Answer

TCP

Answer

TCP uses a SYN, SYN-ACK, ACK three-way handshake to establish a reliable connection before transmitting data.

Question 4

In classful IPv4 addressing, which range of first-octet values identifies a Class B network?

Accepted Answer

128–191

Answer

Class B networks have first-octet values from 128 to 191 and use a default /16 subnet mask.

Question 5

What does ARP (Address Resolution Protocol) map?

Accepted Answer

IP addresses to MAC addresses

Answer

ARP resolves a known IP address to the corresponding MAC (physical) address on a local network segment.

BSCS - Bachelor of Science in Computer Science Practice Test