CCNA Cisco Certified Network Associate Study Guide - FTP Server

68 Chapter 1 � Internetworking
Answers to Review Questions
1. B. The access layer is where users gain access to the network and
where Cisco recommends users plug into switches, which break up
collision domains.
2. C. Protocol Data Units are used to define data at each layer of the OSI
model. PDUs at the Network layer are called packets.
3. D. Routers break up broadcast domains. Routers are defined at the
distribution layer of the OSI model.
4. A. Data is encapsulated with a media access method at the Data Link
layer, and the PDU is called a frame.
5. D. The Transport layer receives large data streams from the upper layers
and breaks these up into smaller pieces called segments.
6. B, C. Crossover cables are used to connect switch to switch and hub to
switch.
7. C. MAC addresses, also called hardware addresses, are used to
uniquely identify hosts on a local network.
8. C. Crossover cables are used to connect hubs to switches, PC to PC,
etc. Pin 1 connects to pin 3 on the other end, and pin 2 connects to
pin 6.
9. D. Routers are defined at the Network layer of the OSI.
10. A. The Physical layer is used to encode 1s and 0s into a digital signal
to be transported over a network medium.
11. C. Bridges break up collision domains and are defined at the Data
Link layer.
12. A. The access layer is used to provide access to users and hosts into the
internetwork, and switches are used to break up Ethernet (contention)
networks at this layer.