5 c a switch uses the mac address of the connected

5. c. A switch uses the MAC address of the connected device to determine the port to which data is
forwarded. Routers use software addresses, such as IP addresses, to make forwarding decisions.
Answer b is not valid. Although there are many addressing schemes used on networks, Ethernet
address is not a valid term. Therefore, Answer d is incorrect. For more information, see the section
“Switches” in this chapter.
6. c. OSPF is a link-state routing protocol used on TCP/IP networks. RIP is a distance-vector routing
protocol used on both TCP/IP and IPX/SPX networks; ARP is a component of the TCP/IP protocol
suite. NLSP is a link-state routing protocol used on IPX/SPX networks. For more information, see
the section “Routers” in this chapter.
7. b. The
ipconfig /all
command shows a range of network-related information, including the
MAC addresses of any installed NICs. Answers a and d are valid, and using the
ipconfig
com-
mand without the
/all
switch shows limited information. For more information, see the section
“Identifying MAC Addresses” in this chapter.
8. b. The uplink port can be used to connect hubs and switches together, using a standard twisted-
pair cable. All the other answers are invalid. For more information, see the section “Working with
Hubs and Switches” in this chapter.
9. c. Routers use the software-configured network address to make routing decisions. Bridges use
MAC addresses to make decisions. Answer d is not valid. The FCS (that is, frame checksum) field
is used for error detection. For more information, see the section “Routers” in this chapter.
10. c. Split horizon is a routing algorithm that dictates that routes are not advertised back on the inter-
face from which they were learned. Answer a describes the operation of the split horizon with poi-
son reverse algorithm. None of the other answers are valid. For more information, see the section
“Routers” in this chapter.
Chapter 3: Networking Components and Devices

167
Apply Your Knowledge
11. c. In a network that uses distance-vector routing protocols, routers advertise details of the routers
they know about. These updates are sent to all the neighbor routers. Answer a describes the
actions on a link-state-based network. Answers b and d are invalid. For more information, see the
section “Routers” in this chapter.
12. d. An active hub regenerates the data signal before forwarding it to all connected devices. Active
hubs come in both managed and unmanaged varieties. Answer b describes the action of a switch.
Answer c is invalid. For more information, see the section “Hubs” in this chapter.
13. a. A count to infinity occurs when two routers provide information on the same destination and so
create a routing loop. All the other answers are invalid. For more information, see the section
“Routers” in this chapter.
14. a. Each step in the path between a router and its destination is called a hop. The other terms are
not used in networking. For more information, see the section “Routers” in this chapter.
15. b.