Chapter 5 test 2
At what layer is the 100BASE-TX standard? A) physical
A
Ethernet addresses were formerly called ________ addresses. A) MAC
A
Switches in an Ethernet LAN are organized in a ________ topology. B) hierarchical
B
The ability to transmit in two directions simultaneously is ________. B) full-duplex communication
B
The distance between two corresponding points in adjacent cycles is the ________. B) wavelength
B
The main benefit of parallel transmission over serial transmission is ________. B) speed
B
The official name for Ethernet addresses is the ________ addresses. B) EUI-48
B
The Ethernet length field gives the length of the ________. C) data field
C
Which UTP quality levels can send signals at 10 gigabits per second? A) category 6 B) category 6A C) both A and B
C
A local area network operates ________. A) on a customer premises
A
Ethernet is inexpensive thanks to ________. A) its hierarchical topology
A
Modal dispersion limits transmission distance in ________. A) multimode fiber
A
UTP categories rate the ________ of UTP cabling. A) quality
A
What form of transmission is most resistant to transmission errors? A) digital
A
What organization creates Ethernet standards? (Give the most specific answer.) A) IEEE
A
Which light wavelength dominates in LANs? A) 850 nm
A
Which working group is likely to develop security standards to be used by multiple LAN/WAN technologies? A) 802.1
A
Physical layer standards govern ________. B) signaling
B
What type of copper wiring is widely used in Ethernet? B) 4-pair UTP
B
What type of switch connects switches to other switches? B) core switches
B
Which UTP quality levels are needed to send signals 100 meters at 10 gigabits per second? B) category 6A
B
Which of the following is relatively immune to small errors? B) binary signaling
B
________ fiber is being sold today. B) OM4
B
CAT 5e and CAT 6 wiring can carry Ethernet traffic 100 meters up to ________. C) 1 Gbps
C
Ethernet standards are specified at the ________ layer. A) Internet B) transport D) neither A nor B
D
Ethernet's hierarchical topology makes it ________. D) neither A nor B
D
Four-pair UTP uses ________ connectors. A) universal B) binary C) ST or SC D) none of the above
D
How many wires are there is a UTP Ethernet cord? D) 8
D
Optical fiber cords use two strands ________. D) for full-duplex transmission
D
Optical fiber's main advantage over UTP is ________. D) greater distance span
D
The purpose of LLC subheader is to ________. D) designate the type of packet in the data field
D
Using priority in Ethernet requires the use of ________ fields. D) tag
D
What type of switch connects users to the network? D) workgroup switches
D
In this book, we use the terms Ethernet and 802.3 interchangeably. T
TRUE
Ethernet standards are specified at the ________ layer. A) physical
A
Ethernet usually has a 100 meter distance limit for ________. A) physical links
A
If an Ethernet receiver detects an error in an arriving frame, it ________. A) drops the frame
A
In LANs, optical fiber typically is used in ________. A) trunk lines
A
In optical fiber, light travels through the ________. A) core
A
4-pair UTP terminates in a(n) ________ connector. B) RJ-45
B
An Ethernet switch knows ________. B) a single port number for each EUI-48 address
B
Ethernet has only a single standard at the ________ layer. B) MAC
B
Ethernet's hierarchical topology tends to create ________. B) lower cost per frame handled
B
Fiber that has a core diameter of 8 microns is ________. B) single-mode fiber
B
In LANs, ________ typically is for ________. B) UTP, access lines
B
In a ________ topology, there is only one possible path between any two hosts. B) hierarchical
B
In binary signaling there is (are) ________ state(s). B) two
B
Creating effective backup links in RSTP is ________. C) difficult and time consuming
C
Ethernet becomes the dominant of LAN technology primarily because of its ________. C) low cost, compared with competing technologies
C
Ethernet can offer ________ priority levels. C) up to 8
C
Ethernet standards are specified at the ________ layer. A) physical B) data link C) both A and B
C
In digital signaling there is (are) ________ state(s). C) a small number of
C
Link aggregation can increase trunk speed by a factor of ________. A) two B) three C) both A and B
C
The Ethernet data field contains ________. A) a packet B) the LLC subheader C) both A and B
C
The longest transmission distances are possible with ________. C) single-mode fiber
C
Untwisting wire pairs no more than 1.25 cm (a half inch) at their ends reduces ________. C) terminal crosstalk interference
C
What 802 Working Group creates Ethernet standards? C) 802.3
C
When the light energies of two pulses arrive at overlapping times, this is ________. C) modal dispersion
C
Which of the following can increase reliability considerably in an Ethernet LAN? D) using the Rapid Spanning Tree Protocol
D
Which of the following is used most heavily in LANs for fiber transmission links? D) multimode fiber
D