ISM 4220 - Oliviera - Chapter 5
1) A network that runs on the customer premises is a ________. A) LAN B) WAN C) Both A and B D) Neither A nor B
A
10) What type switch connects switches to other switches? A) Trunk switches. B) Core switches. C) Workgroup switches. D) None of the above
A
19) Ethernet standards govern the ________ layer. A) physical B) internet C) Both A and B D) Neither A nor B
A
23) Physical layer standards govern ________. A) frame structure B) signaling C) Both A and B D) Neither A nor B
A
27) 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
A
3) A WAN is a network that ________. A) links different sites together B) provides service within about a mile C) provides service within a site D) All of the above
A
31) What form of transmission is most resistant to transmission errors? A) Binary. B) Digital. C) Both are about equally resistant to transmission errors.
A
4) Companies must use carriers for WAN transmission because ________. A) companies lack rights of way B) carriers have extremely strong security C) Both A and B D) Neither A nor B
A
50) 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
A
51) In optical fiber, light travels through the ________. A) core B) cladding C) Neither A nor B
A
114) In 802.1X, the workgroup switch is the ________. A) authentication server B) authenticator C) Both A and B D) Neither A nor B
B
116) Under the Ethernet 802.3ba standard, physical links typically have ________. A) multiple virtual lanes B) multiple media lanes C) Both A and B D) Neither A nor B
B
39) Parallel transmission is transmission over ________. A) 4 wire pairs B) two or more wire pairs
B
58) Modal bandwidth is a measure of ________. A) modal dispersion B) multimode fiber quality C) fiber quality D) propagation speed
B
96) 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
B
111) 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
C
115) 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
C
16) What 802 Working Group creates Ethernet standards? A) 802.1. B) 802.e. C) 802.3. D) 802.11.
C
20) Ethernet standards govern the ________ layer. A) physical B) data link C) Both A and B D) Neither A nor B
C
24) A ________ is a disturbance that propagates down a transmission medium to the other side, which reads it. A) byte B) kilobyte C) signal D) bit
C
33) A length of UTP wiring is a ________. A) run B) fiber C) cord D) strand
C
41) 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) attenuation
C
43) 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) attenuation
C
64) Which is a diameter of multimode fiber? A) 50 microns B) 62.5 microns C) Both A and B D) Neither A nor B
C
71) If both 1000BASE-LX and 1000BASE-SX will serve your needs, which one should you use? A) 1000BASE-LX. B) 1000BASE-SX. C) Either, because both run at the same speed.
C
98) Ethernet became the dominant LAN technology 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
C
117) The 100GBASE-SR10 uses ________ cords. A) 1 B) 2 C) 12 D) 24
D
21) Ethernet standards govern the ________ layer. A) internet B) transport C) Both A and B D) Neither A nor B
D
34) In the UTP wiring used in LANs, how many wires are there in a cord? A) 1 B) 2 C) 4 D) 8
D
36) Four-pair UTP uses ________ connectors. A) snap B) binary C) ST or SC D) None of the above
D
38) The main benefit of parallel transmission over serial transmission is ________. A) reliability B) speed C) Both A and B D) Neither A nor B
D
52) 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 communication
D
66) The principal distance limiting factor for carrier fiber is ________. A) modal bandwidth B) modal dispersion C) latency D) None of the above
D
74) LANs that span distances of several kilometers by using multimode fiber are made possible by ________. A) multimode optical fiber B) high modal dispersion C) high modal bandwidth D) regeneration
D
73) The 1000BASE-T standard has a maximum distance of 100 meters. When this standard is used, this is the maximum distance span of an Ethernet network.
F
79) B2-CC-66-0D-5E-BA is a valid MAC address.
F
80) H2-BC-66-0D-5E-BA is a valid MAC address.
F
84) The Ethernet LLC subheader normally contains an IP packet.
F
105) VLANs address the problem of ________. A) congestion B) reliability C) convergence D) loops
A
112) Under the standard, Ethernet switches can provide enough power over UTP for ________. A) wireless access points B) laptop computers C) Both A and B D) Neither A nor B
A
12) In LANs, optical fiber typically is used in ________. A) trunk lines B) access lines C) Both A and B D) Neither A nor B
A
14) A ________ serves a city and its suburbs. A) MAN B) PAN C) Both A and B D) Neither A nor B
A
15) What organization creates Ethernet standards? (Give the most specific answer.) A) IEEE. B) IETF. C) ISO. D) OSI.
A
18) What 802 Working Group tends to develop security standards to be used by multiple LAN/ WAN technologies? A) 802.1. B) 802.s. C) 802.3. D) 802.11
A
40) Which type of transmission is more widely used today? A) Serial. B) Parallel. C) Both are used about equally.
A
46) UTP categories rate the ________ of cabling. A) quality B) cost C) quality-of-service performance D) error performance
A
56) 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
A
57) Modal dispersion limits transmission distance in ________. A) multimode fiber B) single-mode fiber C) Both A and B D) Neither A nor B
A
59) Multimode fiber distance is limited primarily by ________. A) modal dispersion B) absorptive attenuation C) Both A and B about equally
A
6) A company has more control over its ________ technology. A) LAN B) WAN
A
60) Businesses can select multimode fiber to transmit 1000BASE-SX signals farther by ________. A) buying fiber with lower modal bandwidth B) buying fiber with wider core diameter C) Both A and B D) Neither A nor B
A
63) LAN fiber often uses ________ nm light. A) 850 B) 1,310 C) 1,550 D) All of the above
A
68) Modal bandwidth is a fiber quality measure for ________ fiber. A) LAN B) carrier C) Both A and B D) Neither A nor B
A
69) The use of two or more trunk lines between a pair of switches is ________. A) possible through link aggregation B) impossible because it would create a loop
A
70) Using link aggregation with two or three trunk lines ________ going to a single, faster Ethernet port. A) is less expensive than B) is just as fast as C) Both A and B D) Neither A nor B
A
72) At what layer is the 100BASE-TX standard? A) Physical. B) Data link. C) Internet. D) Physical and data link.
A
75) In Ethernet, synchronization is the purpose of the ________ field. A) preamble B) frame check sequence C) Both A and B
A
82) 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
A
83) The Ethernet data field contains ________. A) a packet B) the LLC subheader C) Both A and B
A
87) If there is a PAD field, it will be added by the ________. A) sender B) receiver C) switch D) Any of the above
A
90) An Ethernet data field is 100 octets long. How long will the PAD be? A) There will not be a PAD. B) 46 octets. C) 1,400 octets. D) 1,500 octets.
A
92) 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
A
97) 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 ProtocolTP
A
101) 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
B
107) A VLAN ID would be found in a ________ field. A) Tag Protocol ID B) Tag Control Information C) Logical Link Control Subheader D) None of the above
B
108) Managed switches ________. A) increase overall costs B) decrease overall costs C) have no impact on overall costs
B
109) A company must have strong security to use the SNMP ________ command. A) Get B) Set
B
110) What is the maximum power for POE in the standard? A) 15 watts. B) 25 watts. C) 75 watts. D) 150 watts.
B
25) In binary signaling there is (are) ________ state(s). A) one B) two C) a few D) an infinite number of
B
53) 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
B
55) For full-duplex transmission, optical fiber normally uses ________. A) 1 strand B) 2 strands C) 4 strands D) 8 strands
B
65) Which is a diameter of multimode fiber? A) 8.3 microns B) 62.5 microns C) Both A and B D) Neither A nor B
B
67) The principal distance limiting factor for LAN fiber is ________. A) modal bandwidth B) modal dispersion C) latency D) None of the above
B
89) An Ethernet data field is 40 octets long. How long will the PAD be? A) There will not be a PAD. B) 6 octets. C) 46 octets. D) 1,460 octets.
B
94) An Ethernet switch knows ________. A) the IP address for each MAC address B) a single port number for each MAC address C) multiple port numbers for each MAC address D) the entire path from the source host to the destination host
B
95) Switches in an Ethernet LAN are organized in a ________ topology. A) mesh B) hierarchical C) point-to-point D) bus
B
103) Creating effective backup links in RSTP is ________. A) completely automatic B) simple and largely automatic C) difficult and time consuming D) impossible
C
2) A LAN is a network that ________. A) links different sites together B) provides international service C) provides service within a site D) All of the above
C
26) In digital signaling there is (are) ________ state(s). A) one B) two C) a few D) an infinite number of
C
35) In the UTP wiring used in LANs, how many wire pairs are there in a cord? A) 1 B) 2 C) 4 D) 8
C
44) In Ethernet, limiting UTP cord runs to 100 meters normally limits ________ to an acceptable level. A) attenuation B) noise errors C) Both A and B D) Neither A nor B
C
45) What type of interference is most frequently a problem? A) Electromagnetic interference. B) Crosstalk interference. C) Terminal crosstalk interference. D) Noise interference.
C
48) 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
C
49) 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
C
78) Ethernet addresses are called ________ addresses. A) MAC B) physical C) Both A and B D) Neither A nor B
C
86) The maximum length of the Ethernet data field is ________ octets. A) 46 B) 100 C) 1,500 D) 10,000
C
100) Ethernet's hierarchical topology makes it ________. A) expensive B) reliable C) Both A and B D) Neither A nor B
D
102) 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.
D
113) 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) POE D) 802.1X
D
8) LAN speeds are faster than WAN speeds. This is because of ________. A) technological limitations B) regulatory limitations C) the slow corporate adoption of newer WAN technologies D) economic reasons
D
88) The minimum length of an Ethernet data field is ________. A) 46 octets B) 64 octets C) 1,500 octets D) There is no minimum length for the Ethernet data field.
D
9) What type of switch connects users to the network? A) User switches. B) Core switches. C) Access switches. D) None of the above
D
91) Ethernet receivers detect errors by using the value in the ________ field. A) PAD B) preamble C) data D) frame check sequence
D
11) In LANs, UTP typically is used for trunk lines.
F
13) In LANs, workgroup switches must be able to carry more traffic than core switches.
F
17) 802.11 is the Working Group that creates Ethernet standards.
F
28) Analog signaling is relatively immune to small errors.
F
42) Untwisting wire pairs no more than 1.25 cm (a half inch) at their ends eliminates terminal crosstalk interference.
F
54) The ability to transmit in two directions simultaneously is called parallel transmission.
F
81) B2-CC-66-0D-5E is a valid MAC address.
F
93) In an Ethernet LAN, switches know the entire data link between the source and destination host.
F
99) A router must spend more time deciding how to forward a packet than a switch must spend to forward a frame.
F
104) Hosts in a VLAN can only communicate with each other.
T
106) VLANs can be used to provide security.
T
22) Ethernet processing executed in hardware.
T
29) Binary signaling is relatively immune to small errors.
T
30) Digital signaling is relatively immune to small errors.
T
32) Clock cycles are necessary in binary transmission.
T
37) Serial transmission is transmission over a single wire pair.
T
47) The Ethernet standard limits UTP propagation distances to 100 meters at all speeds up to 1 Gbps.
T
5) The general name for a company that is given rights of way to lay wires through public areas is carrier.
T
61) Light will travel farther in 50 micron fiber than in 62.5 micron fiber
T
62) Carrier fiber can carry signals farther than LAN fiber.
T
7) Typical LAN speeds are faster than typical WAN speeds.
T
76) Ethernet addresses are called MAC addresses.
T
77) Ethernet MAC layer addresses are also called physical addresses.
T
85) A purpose of the LLC subheader is to describe the type of packet contained in the data field.
T