ICT Networking Models and Protocols 5

Question 1

Which protocol provides reliable, ordered delivery of data at the Transport layer?

Accepted Answer

TCP

Answer

TCP (Transmission Control Protocol) provides connection-oriented, reliable, ordered data delivery using acknowledgments and retransmission.

Question 2

What is the well-known port number for DNS queries?

Accepted Answer

53

Answer

DNS uses port 53 for both UDP (standard queries) and TCP (zone transfers and large responses).

Question 3

In the OSI model, what term describes the unit of data at the Transport layer?

Accepted Answer

Segment

Answer

The Transport layer PDU is called a segment (TCP) or datagram (UDP), containing source/destination ports and data.

Question 4

Which addressing scheme does IPv6 use?

Accepted Answer

128-bit hexadecimal addresses

Answer

IPv6 uses 128-bit addresses expressed in hexadecimal, providing a vastly larger address space than IPv4's 32-bit addresses.

Question 5

Which protocol is used by email clients to retrieve messages from a mail server and supports server-side folder management?

Accepted Answer

IMAP

Answer

IMAP (Internet Message Access Protocol) allows email clients to access and manage messages stored on the server, including folders and flags.

ICT - Information Communication Technology Practice Test