Chapter 5 Ethernet (802.3) Switched LANs
1) A local area network operates ________. A) on a customer premises B) between customer premises C) both A and B D) neither A nor B
Answer: A
10) Which working group is likely to develop security standards to be used by multiple LAN/WAN technologies? A) 802.1 B) 802.e C) 802.3 D) 802.11
Answer: A
11) Ethernet standards are specified at the ________ layer. A) physical B) internet C) both A and B D) neither A nor B
Answer: A
19) What form of transmission is most resistant to transmission errors? A) digital B) analog C) Both are about equally resistant to transmission errors. D) none of the above
Answer: A
25) UTP categories rate the ________ of UTP cabling. A) quality B) speed C) quality-of-service performance D) error performance
Answer: A
30) In optical fiber, light travels through the ________. A) core B) cladding C) both A and B
Answer: A
32) Modal dispersion limits transmission distance in ________. A) multimode fiber B) single-mode fiber C) both A and B D) neither A nor B
Answer: A
39) Which light wavelength dominates in LANs? A) 850 nm B) 1,310 nm C) 1,550 nm D) 1 Gbps
Answer: A
42) Ethernet usually has a 100 meter distance limit for ________. A) physical links B) data links C) routes D) both A and B
Answer: A
43) At what layer is the 100BASE-TX standard? A) physical B) data link C) Internet D) physical and data link
Answer: A
44) Ethernet addresses were formerly called ________ addresses. A) MAC B) EUI-48 C) both A and B D) neither A nor B
Answer: A
49) If an Ethernet receiver detects an error in an arriving frame, it ________. A) drops the frame B) sends an ACK to the sender C) sends a NACK to the receiver D) sends the sender a retransmission request frame
Answer: A
5) In LANs, optical fiber typically is used in ________. A) trunk lines B) access lines C) workgroup switches D) core switches
Answer: A
54) Ethernet is inexpensive thanks to ________. A) its hierarchical topology B) its use of multiple switches C) its use of regeneration D) its use of the Rapid Spanning Tree Protocol
Answer: A
69) A man in the middle attack ________. A) reads traffic traveling between one host to another B) creates a denial service attack on both parties C) creates a denial of service attack against the client D) none of the above
Answer: A
7) What organization creates Ethernet standards? (Give the most specific answer.) A) IEEE B) IETF C) ISO D) OSI
Answer: A
A) wireless access points B) desktop computers C) both A and B D) neither A nor B
Answer: A
14) Ethernet has only a single standard at the ________ layer. A) physical B) MAC C) data link D) Internet
Answer: B
15) Physical layer standards govern ________. A) frame structure B) signaling C) both A and B D) neither A nor B
Answer: B
16) In binary signaling there is (are) ________ state(s). A) one B) two C) a number of D) an infinite number of
Answer: B
18) Which of the following is relatively immune to small errors? A) analog signaling B) binary signaling C) both A and B D) neither A nor B
Answer: B
20) What type of copper wiring is widely used in Ethernet? A) optical fiber B) 4-pair UTP C) both A and B D) neither A nor B
Answer: B
22) 4-pair UTP terminates in a(n) ________ connector. A) USB B) RJ-45 C) SC D) standard telephone
Answer: B
24) The main benefit of parallel transmission over serial transmission is ________. A) reliability B) speed C) both A and B D) neither A nor B
Answer: B
28) Which UTP quality levels are needed to send signals 100 meters at 10 gigabits per second? A) category 6 B) category 6A C) both A and B D) neither A nor B
Answer: B
3) What type of switch connects switches to other switches? A) trunk switches B) core switches C) workgroup switches D) none of the above
Answer: B
33) Fiber that has a core diameter of 8 microns is ________. A) multimode fiber B) single-mode fiber C) full duplex fiber D) exceptionally fast
Answer: B
37) The ability to transmit in two directions simultaneously is ________. A) parallel communication B) full-duplex communication C) both A and B D) neither A nor B
Answer: B
38) The distance between two corresponding points in adjacent cycles is the ________. A) frequency B) wavelength C) bandwidth D) span
Answer: B
4) In LANs, ________ typically is for ________. A) optical fiber, access lines B) UTP, access lines C) UTP, trunk lines D) none of the above
Answer: B
40) ________ fiber is being sold today. A) OM2 B) OM4 C) both A and B D) neither A nor B
Answer: B
45) The official name for Ethernet addresses is the ________ addresses. A) MAC B) EUI-48 C) both A and B D) neither A nor B
Answer: B
51) An Ethernet switch knows ________. A) an IP address for each EUI-48 address B) a single port number for each EUI-48 address C) multiple port numbers for each EUI-48 address D) the entire path from the source host to the destination host
Answer: B
52) Switches in an Ethernet LAN are organized in a ________ topology. A) mesh B) hierarchical C) point-to-point D) bus
Answer: B
53) In a ________ topology, there is only one possible path between any two hosts. A) mesh B) hierarchical C) both A and B D) neither A nor B
Answer: B
57) Ethernet's hierarchical topology tends to create ________. A) greater reliability B) lower cost per frame handled C) both A and B D) none of the above
Answer: B
62) Strong security is needed to ________. A) collect information from remote switches B) reconfigure remote switches C) have a MIB D) reduce total costs
Answer: B
63) What is the maximum power for POE Plus in the standard? A) 15 watts B) 25 watts C) 75 watts D) 150 watts
Answer: B
67) In 802.1X, the workgroup switch is the ________. A) authentication server B) authenticator C) both A and B D) neither A nor B
Answer: B
12) Ethernet standards are specified at the ________ layer. A) physical B) data link C) both A and B D) neither A nor B
Answer: C
17) In digital signaling there is (are) ________ state(s). A) one B) two C) a small number of D) an infinite number of
Answer: C
26) CAT 5e and CAT 6 wiring can carry Ethernet traffic 100 meters up to ________. A) 10 Mbps B) 100 Mbps C) 1 Gbps D) 10 Gbps
Answer: C
27) Which UTP quality levels can send signals at 10 gigabits per second? A) category 6 B) category 6A C) both A and B D) neither A nor B
Answer: C
29) Untwisting wire pairs no more than 1.25 cm (a half inch) at their ends reduces ________. A) interference B) crosstalk interference C) terminal crosstalk interference D) none of the above
Answer: C
31) When the light energies of two pulses arrive at overlapping times, this is ________. A) multimode transmission B) modal bandwidth C) modal dispersion D) modal interference
Answer: C
34) The longest transmission distances are possible with ________. A) USB B) UTP C) single-mode fiber D) multimode fiber
Answer: C
41) Link aggregation can increase trunk speed by a factor of ________. A) two B) three C) both A and B D) neither A nor B
Answer: C
46) The Ethernet data field contains ________. A) a packet B) the LLC subheader C) both A and B D) neither A nor B
Answer: C
48) The Ethernet length field gives the length of the ________. A) frame B) frame, less the frame check field's size C) data field D) data field plus PAD
Answer: C
55) Ethernet becomes the dominant of LAN technology primarily because of its ________. A) high speed, compared with competing technologies B) use of multiple switches C) low cost, compared with competing technologies D) sophistication, compared with competing technologies
Answer: C
59) Creating effective backup links in RSTP is ________. A) completely automatic B) simple and largely automatic C) difficult and time consuming D) impossible
Answer: C
60) Ethernet can offer ________ priority levels. A) up to 2 B) up to 4 C) up to 8 D) Ethernet cannot offer priority levels
Answer: C
61) Managed Ethernet switches ________. A) are not standardized B) are managed by an outsourcing company C) reduce hardware costs D) reduce labor costs
Answer: C
64) Under the standard, Ethernet switches can provide enough power over UTP for ________. A) wireless access points B) voice over IP telephones C) both A and B D) neither A nor B
Answer: C
68) Which of the following is a benefit of using a central authentication server? A) consistency in authentication B) faster changes when authentication information needs to be changed C) both A and B D) neither A nor B
Answer: C
70) ARP cache poisoning can be defeated using ________. A) 802.1X B) 802.3 Lock C) 802.1AE D) 802.2
Answer: C
8) What 802 Working Group creates Ethernet standards? A) 802.1 B) 802.2 C) 802.3 D) 802.11
Answer: C
13) Ethernet standards are specified at the ________ layer. A) Internet B) transport C) both A and B D) neither A nor B
Answer: D
2) What type of switch connects users to the network? A) user switches B) core switches C) access switches D) workgroup switches
Answer: D
21) How many wires are there is a UTP Ethernet cord? A) 1 B) 2 C) 4 D) 8
Answer: D
23) Four-pair UTP uses ________ connectors. A) universal B) binary C) ST or SC D) none of the above
Answer: D
35) Which of the following is used most heavily in LANs for fiber transmission links? A) modal bandwidth fiber B) 1.550 nm fiber C) single-mode fiber D) multimode fiber
Answer: D
36) Optical fiber cords use two strands ________. A) for reliability through redundancy B) to form a complete electrical loop C) to double the transmission speed D) for full-duplex transmission
Answer: D
47) The purpose of LLC subheader is to ________. A) permit error detection B) divide the data field from the trailer C) divide the header from the data field D) designate the type of packet in the data field
Answer: D
50) Using priority in Ethernet requires the use of ________ fields. A) QoS B) flag C) extension D) tag
Answer: D
56) Ethernet's hierarchical topology makes it ________. A) expensive B) reliable C) both A and B D) neither A nor B
Answer: D
58) Which of the following can increase reliability considerably in an Ethernet LAN? A) using a hierarchical topology B) using a mesh topology C) using a bus topology D) using the Rapid Spanning Tree Protocol
Answer: D
6) Optical fiber's main advantage over UTP is ________. A) lower cost B) lower fragility C) higher speed D) greater distance span
Answer: D
66) The ________ standard was created to prevent attackers from walking in and simply plugging a computer into a wall jack and therefore accessing the network. A) Ethernet firewall B) 802.1AE C) 802.3X D) 802.1X
Answer: D
9) In this book, we use the terms Ethernet and 802.3 interchangeably.
Answer: TRUE