Which of the following service combinations are provided by the Internet…
2010
Which of the following service combinations are provided by the Internet layer?
Quality of service
Routing
Logical addressing
Connection-oriented delivery
Framing of bits
Answer: A. 1, 2, 3 — ConceptThe Internet layer provides a connectionless datagram service across interconnected networks. Its core responsibilities include logical addressing and…
- A.
1, 2, 3
- B.
2, 3, 4
- C.
1, 3, 4, 5
- D.
2, 3, 4, 5
Attempted by 125 students.
Show answer & explanation
Correct answer: A
Concept
The Internet layer provides a connectionless datagram service across interconnected networks. Its core responsibilities include logical addressing and routing; the IP header's service field also supports differentiated quality-of-service handling.
Reliability and connection management belong to transport protocols such as TCP, while framing packets into link-layer frames is performed below IP.
Application
Statement | Layer-based assessment |
|---|---|
1. Quality of service | The IP header carries a service field for differentiated traffic handling. |
2. Routing | Routers select a next hop by consulting a routing table. |
3. Logical addressing | IP supplies source and destination addresses for delivery across networks. |
4. Connection-oriented delivery | Connection establishment, reliability, and ordered delivery are transport-layer functions provided by protocols such as TCP. |
5. Framing of bits | A link-layer protocol places an IP datagram in a frame for transmission over a particular network. |
The Internet-layer entries in the list are therefore 1, 2, and 3.
Contrast
The set 2, 3, 4 includes connection-oriented delivery, which belongs to the transport layer in the TCP/IP model.
The set 1, 3, 4, 5 omits routing and combines transport-layer connection management with link-layer framing.
The set 2, 3, 4, 5 includes transport-layer connection management and link-layer framing.
Cross-check
RFC 1812 describes IP as a connectionless datagram service, lists addressing and type-of-service support, and explains that routers forward through routing tables. It separately assigns reliable connection-oriented service to TCP and places framing below the Internet layer.
Result
Hence the supported combination is 1, 2, and 3.