Reference no: EM13161770
1.The Ethernet Standards are also known as the _______ standards.
a. IEEE
b. 802.3*
c. 802
d. ATM
e. LAN
2.CSMA/CD provides a way to:
a. control networks so that only one station transmits at any one moment.*
b. allow multiple stations to transmit concurrently.
c. allow secure network transmissions to occur between two registered stations.
d. allow secure network transmissions to occur between any two stations.
3.CSMA recognizes the fact that:
a. multiple stations may wish to share a single MAC address.
b. there can never be more than two stations attempting to transmit packets at any given moment.
c. different types of media can support different communications speeds.
d. multiple stations may attempt to transmit concurrently.*
e. any collision that occurs can crash the network.
4.CSMA/CD controls transmissions by ____ in order to avoid collisions.
a. hubs
b. hubs and NICs*
c. switches
d. hubs, NICs, and switches
e. NICs
5._____ switches normally connect a station to the network.
a. Core
b. Workgroup
c. Both of the above.
d. Neither a. nor b.
6.Which statement most accurately compares wireless LANs to conventional wired LANs?
a. Wireless LANs typically have more propagation problems.*
b. Wireless LANs typically have slower speeds, but fewer congestion problems.
c. Wireless LANs require licenses to use radio frequencies, conventional LANs are unlicensed.
d. All of the above are true.
7.Which of the following statements best describes how wireless collisions are handled?
a. Stations use CSMA/CD to detect collisions and to retransmit when they occur.
b. Stations use CSMA/CD to detect collisions and then retransmit to an adjacent access point when collisions are detected.
c. Stations use CSMA/CA+ACK to avoid errors and retransmit frames that do not get through.*
d. When an error is detected, both the sending and receiving workstations retransmit on another frequency.
8.How many channels does 802.11b support?
a. 1
b. 3*
c. 7
d. 9
e. 11
9.Taking your cellular telephone from one cell to another in the same city is _____.
a. roaming
b. handoff
c. Either of the above.
10.How many MTSOs MUST be used to connect a local cellular customer to someone's wired office telephone?
a. 0, as long as the caller is not roaming.
b. 1
c. 2
d. 3
e. 4
11.Channel reuse is done to _____.
a. reduce cost
b. increase the number of possible subscribers
c. increase transmission speeds
d. improve voice quality
12.What is the biggest problem that you are likely to encounter when trying to take your cellular phone outside of the U.S.?
a. Lack of tariffs
b. Lack of compatible transmission standards*
c. Lack of local cellular service providers
d. Lack of ability to recognize longer U.S. style telephone numbers
e. Lack of AC power availability to charge your phone's battery
13.A cellular system operates at 56 kbps. This is a _____ service.
a. 1G b. 2G c. 2.5G* d. 3G
14.In the U.S., which type of carrier handles calls within a LATA?
a. LATA carriers b. LECs c. PTTs
d. ILECs, but not CLECs e. IXCs
15.In the U.S., which type of carrier handles calls to international destinations?
a. CLECs b. ICCs c.IXCs d. POPs e. PTTs
16.Which of the following is an intra-LATA carrier in the United States?
a. ICCs b. IXCs c. CLECs d. PTTs
e. Both c. and d.
17.HTTP is used at the ________ layer.
a. Physical b. Data Link c. Application
d. Internet e. Transport
18.Select the MOST correct statement about IP addresses.
a.The host portion must appear first.
b.The host portion must appear last.
c.The host portion must appear first and must contain 16 bits.
d.The host portion must appear last and must contain 16 bits.
e.The host portion is optional.
19.How often does a router make routing decisions?
a. Once for each and every packet that it receives.
b. Once for each group of packets that it receives with the same source and destination addresses.
c. Once for each group of packets it receives with the same source address.
d. Once for each group of packets it receives with the same destination address.
20.Whena router encounters an error in an IP header it:
a. returns the packet to the sending router.
b. returns the packet to the sending router with an error advisement.
c. discards the packet.
d. discards the packet and returns an error advisement.
e. discards the packet, returns an error advisement, and requests a retransmission.
21.The most common way that viruses and worms are spread is via:
a. FTP.
b. instant messaging.
c. e-mail.
d. Web browsing.
e sharing diskettes.