Chapter 5 Practice Test Answers
1. C. Hubs are the most basic form of multistation access unit. They are used to
connect devices, such as computers and printers, in a network.
2. A. Active hubs have the ability to repair weak signals. They do this by
regenerating or amplifying the data signal.
3. D. Hubs operate at the Physical layer of the OSI Model, since they are concerned
only with electrical signal processing.
4. B. Instead of just copying and sending data out to every device on the network, a
switch has the ability to learn the physical addresses of all the devices on the
network.
5. C. Layer 3 switches incorporate features of both routers and switches.
6. C. Most switches have the ability to auto-sense network transmission speeds. For
example, if you have several devices on a network that transmit at 10Mbps and
other devices that transmit at 100Mbps, the switch can automatically sense those
transmission speeds and make adjustments to ensure the data gets delivered
reliably. It does this by using a buffering process. The switch will intercept the
data, place it in memory, and then transmit it at either a faster or slower speed.
7. B. A VLAN is a group of network devices (workstations, servers, printers, etc.)
that can be grouped into a logical network, without regard for physical location.
8. C. Bridges decide which packets to pass between networks through the use of a
routing table.
9. A. Source-route bridging is commonly found on Token Ring networks.
10. D. If a bridge cannot find the address in its routing table, it forwards the packets
to all of the network segments.
11. D. Bridges work at the Data Link layer of the OSI Model.
12. B. The transparent bridge has the capability of automatically identifying all of the
devices that are connected to each segment of the network.
13. A. Routers are the devices used to connect local area networks (LANs), making a
wide area network (WAN).
14. C. Routers lie at the Network layer of the OSI Model.
15. B. Static tables are built manually by an administrator.
16. A and C. Any routers that are more than 15 hops away are unreachable. RIP also
suffers from slow convergence.
17. D. Gateways work at the top four layers (4 through 7: Application, Presentation,
Session, and Transport) of the OSI Model.
18. C. A DSU provides a terminal connection to a digital line.
19. D. The U interface is used when transmitting the data signal over long distances,
such as from your home to a telephone switching station or the central telephone
office.
20. A. When a modem receives data, it “demodulates” meaning it takes the analog
signal from the cable and changes it into a digital signal that can be understood by
the computer.