ICT Networking Models and Protocols 3

Question 1

What does the acronym 'PDU' stand for in networking?

Accepted Answer

Protocol Data Unit

Answer

PDU stands for Protocol Data Unit, the generic term for data at each OSI layer (e.g., segment at Transport, packet at Network, frame at Data Link).

Question 2

Which protocol is used to automatically assign IP addresses to devices on a network?

Accepted Answer

DHCP

Answer

DHCP (Dynamic Host Configuration Protocol) automatically assigns IP addresses, subnet masks, default gateways, and DNS server addresses to clients.

Question 3

The three-way handshake used by TCP involves which sequence of messages?

Accepted Answer

SYN → SYN-ACK → ACK

Answer

TCP establishes a connection with SYN from client, SYN-ACK from server, then ACK from client — a three-way handshake.

Question 4

Which OSI layer adds a MAC address header to data, creating a frame?

Accepted Answer

Data Link layer

Answer

The Data Link layer (Layer 2) encapsulates packets into frames and adds source and destination MAC addresses.

Question 5

In IPv4, what is the purpose of the subnet mask?

Accepted Answer

To identify the network and host portions of an IP address

Answer

A subnet mask distinguishes the network portion from the host portion of an IPv4 address, enabling proper routing decisions.

ICT - Information Communication Technology Practice Test