Knowledge Checks

Location of transport-layer functionality.

Where is transport-layer functionality primarily implemented?

Transport layer functions are implemented primarily at the routers and switches in the network.

Transport layer functions are implemented primarily at each end of a physical link connecting one host/router/switch to another one host/router/switch.

Transport layer functions are implemented primarily at the hosts at the “edge” of the network.

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1/5

Transport-layer functionality.

True or False: The transport layer provides for host-to-host delivery service?

True.

False

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2/5

Transport layer services using TCP.

Check all of the services below that are provided by the TCP protocol.

A message abstraction, that preserves boundaries between message data sent in different socket send calls at the sender.

A congestion control service to ensure that multiple senders do not overload network links.

A guarantee on the maximum amount of time needed to deliver data from sender to receiver.

Reliable data delivery.

A byte stream abstraction, that does not preserve boundaries between message data sent in different socket send calls at the sender.

In-order data delivery

A guarantee on the minimum amount of throughput that will be provided between sender and receiver.

A flow-control service that ensures that a sender will not send at such a high rate so as to overflow receiving host buffers.

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3/5

Transport-layer services using UDP.

Check all of the services below that are provided by the UDP protocol.

In-order data delivery

A byte stream abstraction, that does not preserve boundaries between message data sent in different socket send calls at the sender.

A congestion control service to ensure that multiple senders do not overload network links.

A guarantee on the maximum amount of time needed to deliver data from sender to receiver.

Reliable data delivery.

A flow-control service that ensures that a sender will not send at such a high rate so as to overflow receiving host buffers.

A message abstraction, that preserves boundaries between message data sent in different socket send calls at the sender.

A guarantee on the minimum amount of throughput that will be provided between sender and receiver.

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4/5

Network-layer functionality.

The transport layer sits on top of the network layer, and provides its services using the services provided to it by the network layer. Thus it’s important that we know what is meant by the network layer’s “best effort” delivery service. True or False:

The network layer’s best-effort delivery service means that IP makes its “best effort” to deliver segments between communicating hosts, but it makes no guarantees. In particular, it does not guarantee segment delivery, it does not guarantee orderly delivery of segments, and it does not guarantee the integrity of the data in the segments.

Nope. The network layer’s best effort service doesn’t really provide much service at all, does it?

Correct! The network layer’s best effort service doesn’t really provide much service at all, does it?

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5/5

Knowledge checks

Location of transport-layer functionality.

Transport-layer functionality.

Transport layer services using TCP.

Transport-layer services using UDP.

Network-layer functionality.