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+12 votes

Match the following:

(P) SMTP (1) Application layer
(Q) BGP (2) Transport layer
(R) TCP (3) Data link layer
(S) PPP (4) Network layer
    (5) Physical layer


  1. P - 2, Q - 1, R - 3, S - 5
  2. P - 1, Q - 4, R - 2, S - 3
  3. P - 1, Q - 4, R - 2, S - 5
  4. P - 2, Q - 4, R - 1, S - 3
asked in Computer Networks by Veteran (59.4k points) | 1.7k views

Answer: Option (B).

P - 1, Q - 4, R - 2 is Self Explanatory, but for S-PPP , refer:

In terms of the OSI model, PPP provides Layer 2, or data-link, service. PPP is a full-duplex protocol that can be used on a variety of physical media, including twisted pair copper wire, fiber optic lines or satellite links. PPP uses a variation of High-level Data Link Control (HDLC) for packet encapsulation.

4 Answers

+21 votes
Best answer

Answer is B
SMTP is an application layer protocol used for e-mail transmission.
TCP is a core transport layer protocol.
BGP is a network layer protocol backing the core routing decisions on the Internet
PPP is a data link layer protocol commonly used in establishing a direct connection between two networking 

answered by Active (3.8k points)
selected by
BGP is a application layer protocol
BGP is n/w layer protocol,it is used to scale OSPF efficiently.

doubt : but Wikipedia says BGP is application layer protocol

+12 votes
I guess answer is (b) here.PPP is a data link layer protocol
answered by Active (2.3k points)
+6 votes
Correct answer is :: P - 1, Q - 4, R - 2, S - 3

SMTP is application layer protocol but take help of TCP for activation over link for transfering mail.

TCP:: It is transport layer protocol.

BGP:: Border Gateway procoly is used to connect two AS and used in Network layer.

While PPP:: Point to point connection with the help of MAC will come under the category of Data Link layer.
answered by Loyal (8.6k points)
–5 votes
The answer is (C). PPP - refers to Point to Point Protocol which falls under Physical Layer.
answered by (17 points)

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