Knowledge Checks

Layers in the Internet protocol stack.

Match the function of a layer in the Internet protocol stack to its its name in the pulldown menu.

Question List:

Protocols that are part of a distributed network application.

Transfer of data between one process and another process (typically on different hosts).

Delivery of datagrams from a source host to a destination host (typically).

Transfer of data between neighboring network devices.

Transfer of a bit into and out of a transmission media.

Answer List:

Physical layer
Link layer
Network layer
Application Layer
Transport layer

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1/4

What’s a “packet” really called?

Match the name of an Internet layer with unit of data that is exchanged among protocol entities at that layer, using the pulldown menu.

Question List:

Application layer

Transport layer

Network layer

Link layer

Physical layer

Answer List:

Bit
Segment
Message
Frame
Datagram

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2/4

Protocol headers.

Consider the figure below, showing a link-layer frame heading from a host to a router. There are three header fields shown. Match the name of a header with a header label shown in the figure.

Question List:

Header H₁

Header H₂

Header H₃

Answer List:

_{Transport layer}
Application layer
_{Link layer}
Physical layer
_{Network Layer}

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3/4

What is "encapsulation"?

Which of the definitions below describe what is meant by the term "encapsulation"?

Starting a transport layer timer for a transmitted segment, and then if an ACK segment isn’t received before the timeout, placing that segment in a retransmission queue.

Receiving a “packet” from the layer below, extracting the payload field, and after some internal actions possibly delivering that payload to an upper layer protocol.

Taking data from the layer above, adding header fields appropriate for this layer, and then placing the data in the payload field of the “packet” for that layer.

Determining the name of the destination host, translating that name to an IP address and then placing that value in a packet header field.

Computing the sum of all of the bytes within a packet and placing that value in the packet header field.

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Knowledge checks

Layers in the Internet protocol stack.

Question List:

Answer List:

What’s a “packet” really called?

Question List:

Answer List:

Protocol headers.

Question List:

Answer List:

What is "encapsulation"?