The machines used to connect different networks are called

The collection of interconnected networks is called

Most networks are organised as a series of

The purpose of each layer in a network is to offer services to ____ layers.

The rules and conventions used in the layers conversation are collectively known as

The entities comprising the corresponding layers on different machines are called

Interfaces make it ____ to replace the implementation of a layer.

Between each pair of adjacent layers in a network, there is an

Interface _____ the amount of information that must be passed between layers.

The details of the implementation of interfaces are

A set of layers and protocols is called a

The specification of the interfaces are

It is ____ that the interfaces on all the machines in a network be the same.

A list of protocols used by a system is called

A _____ is put in front of the message to identify it.

The header includes _____ information.

Control information can be a ____ number.

Time can be inserted in _____.

Data transfer in two directions simultaneously is called

Data transfer in only one direction is called

Some form of ____ is needed in order to specify a destination for a packet.

Data transfer in two directions but not simultaneously is called

Physical communication circuits are

To use the same connection for multiple unrelated conversations is called

When there are _____ paths between source and destination, a route must be chosen.