application
b. data link
c. network
d. transport
19. Match each layer with the function it performs in peer-to-peer communication.
____1. network layer
____2. data link layer
____3. physical layer
Review Questions 131
a. Encapsulates the network layer packet in a frame
b. Moves the data through the internetwork by encapsulating the data and attaching
a header to create a packet
c. Encodes the data link frame into a pattern of 1s and 0s (bits) for transmission on
the medium (usually a wire)
20. What is the function of a network protocol?
a. Uses sets of rules that tell the services of a network what to do
b. Ensures reliable delivery of data
c. Routes data to its destination in the most ef?¬?cient manner
d. Is a set of functions that determine how data is de?¬?ned
21. Match each TCP/IP stack layer to its function.
____1. Provides applications for ?¬?le transfer, network troubleshooting, and
Internet activities, and supports the network
____2. De?¬?nes how data is formatted for transmission and how access to the
network is controlled
____3. De?¬?nes the electrical, mechanical, procedural, and functional
speci?¬?cations for activating, maintaining, and deactivating the physical link
between end systems
____4.
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