Question

Consider the following statements on TCP/IP
A. At the physical and data link layers, TCP/IP does not define any specific protocol.
B. At the internetwork layer, TCP/IP supports the Internetworking Protocol.
C. At the transport layer, TCP/IP defines five protocols.
Choose the correct answer from the options given below:

• A. A only
• B. A and C only
• C. A and B only
• D. A, B and C

Hint:

The strength of the TCP/IP model is its modularity. It doesn't care about the physical medium (Layer 1) or local network access (Layer 2), allowing it to connect diverse types of networks. Its core is IP (Layer 3) for routing and TCP/UDP (Layer 4) for transport.

Answer 1

The Correct Option is C

Step 1: Evaluate statement A. "At the physical and data link layers, TCP/IP does not define any specific protocol." This is True. The TCP/IP model is a protocol suite that primarily deals with the Network layer and above. It is designed to be independent of the underlying network hardware and data link protocols. It can run over Ethernet, Wi-Fi, PPP, etc., but it does not define these lower-level protocols itself.
Step 2: Evaluate statement B. "At the internetwork layer, TCP/IP supports the Internetworking Protocol." This is True. The Internetworking Protocol is another name for the Internet Protocol (IP), which is the core protocol of the internetwork layer in the TCP/IP suite.
Step 3: Evaluate statement C. "At the transport layer, TCP/IP defines five protocols." This is False. The two primary and most well-known protocols defined at the transport layer of the TCP/IP suite are TCP (Transmission Control Protocol) and UDP (User Datagram Protocol). While other transport protocols exist (like SCTP), the suite does not define five main ones.
Step 4: Combine the correct statements. Statements A and B are true. Therefore, the correct option is "A and B only".