Source-to-destination delivery of a packet across multiple network links is done by

Source-to-destination delivery of a packet across multiple network links is done by

Chapter 2

Review Questions

1. List the layers of the Internet model.

Ans: The layers of TCP or Internet model are:

i. Physical layer

ii. Data link layer

iii. Network layer

iv. Transport layer and

v. Application layer.

2. Which layers in the Internet model are the network support layers?

Ans: Physical, data link, and network layers.

3. Which layer in the Internet model is the user support layer?

Ans: In the Internet Model only Application layer supports the user.

4. What is the difference between network layer delivery and transport layer delivery?

Ans: The transport layer is responsible for process-to-process delivery of the entire message, but

the network layer oversees host-to-host delivery of individual packets.

5. What is a peer-to-peer process?

Ans: Peer-to-peer processes are processes on two or more devices communicating at a same

layer

6. How does information get passed from one layer to the next in the Internet model?

Ans: Each layer calls upon, the services of the layer just below it using interfaces between each

pair of adjacent layers.

7. What are headers and trailers, and how do they get added and removed?

Ans: Headers and trailers are control data added at the beginning and the end of each data unit at

each layer of the sender and removed at the corresponding layers of the receiver. They provide

source and destination addresses, synchronization points, information for error detection etc.

8. What are the concerns of the physical layer in the Internet model?

Ans: The physical layer is responsible for transmitting bits. Also it is concerned with

a. physical topology

b. representation of bits

c. type of encoding

d. synchronization of bits

e. transmission rate and mode

f. Line Configuration

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    The network layer is responsible for the delivery of individual packets from the source host to the destination host.

    Which layer is responsible for source to destination delivery?

    The Transport layer is a true source-to-destination or end-to-end layer.

    Which layer is responsible for packet delivery?

    The Network layer of the OSI model is responsible for packet delivery from end to end. It does this by using another addressing scheme that can logically identify every node connected to the Internet. This addressing scheme is known as the Internet Protocol address, or the IP Address.

    Which network is responsible for process to process delivery?

    The transport transport layer is responsible responsible for process-to- process delivery—the delivery of a packet, part of a message, from one process to another.