IST 220 Exam 2

A local area network operates ________. A.) on a customer premises B.) neither on and between customer premises C.)both on and between customer premises D.) between customer premises

A.)

Access points take ________ from wireless devices and send them on to devices on the wired LAN. They also do the converse. (CAREFUL) A.) packets B.) both packets and frames C.) none of these D.) frames

A.)

According to the textbook, which of the following is used most heavily in LANs for fiber transmission links? A.) multimode fiber B.) modal bandwidth fiber C.) single-mode fiber D.) 1.550 nm fiber

A.)

At 10 meters, a signal has a strength of 40 mW. About how strong will it be at 20 meters? A.) about 10 mW B.) about 20 mW C.) about 2.5 mW D.) about 160 mW

A.)

CAT 5e and CAT 6 wiring can carry Ethernet traffic 100 meters up to ________. A.) 1 Gbps B.) 10 Mbps C.) 100 Mbps D.) 10 Gbps

A.)

CSMA/CD+ACK is ________. A.) reliable B.) unreliable C.) semireliable

A.)

Companies are moving to the 5 GHz band because there is ________ than in the 2.4 GHz band. A.) more bandwidth B.) less absorptive attenuation C.) none of these D.) both more bandwidth and less absorptive attenuation

A.)

Ethernet addresses were FORMERLY called ________ addresses but are now called ___________. A.) MAC, EUI-48 B.) EUI-48, MAC C.) IP, Socket D.) MAC, IP

A.)

Ethernet becomes the dominant of LAN technology primarily because of its ________. A.) low cost, compared with competing technologies B.) high speed, compared with competing technologies C.) sophistication, compared with competing technologies D.) use of multiple switches

A.)

Ethernet standards are specified at the ________ layer. A.)data link B.)neither transport nor data link C.)both transport and data link D.)transport

A.)

To use an access point, you need to know its ________. A.) SSID B.) BSSID C.) ESSID D.) Wi-Fi ID

A.)

Wireless network standards are ________ standards. A.) OSI B.) TCP/IP C.) none of these D.) both OSI and TCP/IP

A.)

A single access point and the set of hosts it serves is called a(n) ________. A.) BSSID B.) BSS C.) ESS D.) none of the above

B.)

A wireless host sends a packet to a server on the company's wired Ethernet LAN via an access point. How many frames will be involved in this one-way transmission? A.) 1 B.) 2 C.) 4 D.) There will be one frame for each switch along the way.

B.)

Access points in the same ESS communicate via ________. A.) wireless transmission B.) the distribution system C.) routers D.) a master access point

B.)

According to the textbook, which light wavelength dominates in LANs? A.) 1 Gbps B.) 850 nm C.) 1,550 nm D.) 1,310 nm

B.)

Ethernet usually has a 100 meter distance limit for ________. A.) data links B.) physical links C.) both physical links and data links D.) routes

B.)

Ethernet's hierarchical topology makes it ________. A.) reliable B.) neither expensive nor reliable C.) both expensive and reliable D.) expensive

B.)

If an 802.11n client tries to use an 802.11ac access point, ________. A.) they will communicate using either 802.11ac or 802.11n B.) they will communicate using 802.11n C.) they will communicate using 802.11ac D.) they will not be able to communicate

B.)

In ________, when a wireless host wishes to send, it first sends a message to the wireless access point asking for permission to send. When the access point sends back a response, the host sending the original message may transmit. All other hosts must wait. A.) CSMA/CA+ACK B.) RTS/CTS C.) CSMA/CD D.) CSMA/CA

B.)

In the 5 GHz band, how many channels can you have with 802.11ac with 80 GHz channels? A.) 24 B.) 6 C.) 12 D.) 1

B.)

Link aggregation can increase trunk speed by a factor of ________. A.) none of these B.) depends on the number of links you aggregate C.) two D.) three

B.)

Modal dispersion limits transmission distance in ________. A.) single-mode fiber B.) multimode fiber C.) none of these D.) Cat 6 cable

B.)

The maximum length for the data area of a frame is how many bytes? A.) 1472 B.) 1500 C.) 1518 D.) 1522

B.)

Wireless radio transmission speed is usually measured in terms of ________. A.) wetness B.) frequency C.) wavelength D.) amplitude

B.)

________ is a technique for preventing two wireless stations from transmitting at the same time and therefore interfering with each other. A.) Roaming B.) Media access control C.) Creating extended service sets D.) The distribution system

B.)

An Ethernet switch knows ________. A.) multiple port numbers for each EUI-48 address B.) a list of unique EUI-48 addresses and their associated port number C.) the entire path from the source host to the destination host D.) an IP address for each EUI-48 address

B.) DOUBLE CHECK THIS

A cellular telephone uses a(n) ________. A.) dish antenna B.) phased array C.) omnidirectional antenna D.) none of these

C.)

A channel extends from 55 MHz to 60 MHz. Its bandwidth is ________. A.) 55 MHz B.) 65 MHz C.) none of the above D.) 60 MHz

C.)

Beamforming can allow an access point to ________. A.) direct power to individual clients B.) none of these C.) both direct power to individual clients and send signals to two different clients at the same time D.) send signals to two different clients at the same time

C.)

Ethernet UTP terminates in a(n) ________ connector. A.) USB B.) SC C.) RJ-45 D.) standard telephone

C.)

If an Ethernet receiver detects an error in an arriving frame, it ________. A.) sends a NACK to the receiver B.) sends the sender a retransmission request frame Answer: A C.) drops the frame D.) sends an ACK to the sender

C.)

If an uplink from switch to switch is forwarding traffic on multiple VLAN's, we call this uplink a _____. A.) Multiplexer B.) None of these C.) Trunk D.) T-Uplink

C.)

If more users move to an access point, this decreases ________. A.) aggregate throughput B.) none of these C.) individual throughput D.) both individual and aggregate throughput

C.)

In 802.11g, channel bandwidth usually is ________. A.) 20 GHz B.) 40 GHz C.) 20 MHz D.) 40 MHz

C.)

In LANs, optical fiber typically is used in ________. A.) phone lines B.) fishing lines C.) trunk lines D.) access lines

C.)

In a ________ topology, there is only one possible path between any two hosts. A.) both mesh and hierarchical B.) mesh C.) hierarchical D.) neither mesh nor hierarchical

C.)

In digital signaling there is (are) ________ state(s). A.) none of these B.) two C.) a small number of D.) one

C.)

In unlicensed bands, ________. A.) You must pay a license fee B.) you can prevent nearby businesses from setting up access points in the same channel C.) you can use radios wherever you please D.) none of these

C.)

Switches in an Ethernet LAN are organized in a ________ topology. A.) point-to-point B.) mesh C.) hierarchical D.) bus

C.)

The 2.4 GHz band supports ________ possible non-overlapping 20 MHz channel(s). A.) 1 B.) 7 C.) 3 D.) 11

C.)

The 802.11 standard for mesh networking is ________. A.) 802.11ac B.) 802.11r C.) 802.11s D.) 802.11m

C.)

The Ethernet data field contains ________. A.) the LLC subheader B.) a packet C.) both a packet and the LLC subheader D.) neither a packet nor the LLC subheader

C.)

The most serious problem with wireless transmission in WLANs is ________. A.) shadow zones B.) absorptive attenuation C.) multipath interference D.) inverse square law attenuation

C.)

The other wireless device is far away in a known direction. It would be better to use ________. A.) Both will work the same B.) none of these C.) a dish antenna D.) an omnidirectional antenna

C.)

The standard for roaming among access points is ________. A.) 802.11W B.) 802.11s C.) 802.11r D.) WPS

C.)

What is the maximum power for POE Plus in the standard? A.) 15 watts B.) 150 watts C.) 25 watts D.) 75 watts

C.)

What type of switch connects users to the network? A.) core switches B.) user switches C.) workgroup switches D.) gateway switches

C.)

An access point can transmit to more than one wireless client at a time with ________. A.) bonding B.) CSMC/CA+ACK C.) MIMO D.) Multiuser MIMO

D.)

An extended service set (ESS) is a group of BSSs that ________. A.) are connected to the same distribution system B.) none of these C.) have the same SSID D.) are connected to the same distribution system and have the same SSID

D.)

Channels with wide bandwidths are called ________ channels. A.) parallel B.) multimode C.) full-duplex D.) broadband

D.)

What type of copper wiring is widely used in Ethernet? A.) optical fiber B.) neither 4-pair UTP nor optical fiber C.) both 4-pair UTP and optical fiber D.) 4-pair UTP

D.)

Which of the following only operates in the 5 GHz band? A.) 802.11n B.) 802.11g C.) 802.11b D.) 802.11ac

D.)

Given the following information, Switch 1 Host A connected on port 15 and is on VLAN 42 Host B connected on port 10 is on VLAN 27 Trunk link connected on port 25 to Switch 2 Switch 2 Host C connected on port 3 is on VLAN 27 Host D connected on port 5 is on VLAN 27 Host E connected on port 6 is on VLAN 42 Trunk link connected on port 32 to Switch 1 Which host or hosts can Host B communicate with? A.) C, D B.) A C.) A, E D.) A, B, C, D, E

A.)

Like FM radio and Broadcast TV, in WLANs 2.4 GHz and 5 GHz are ________. A.) service bands B.) frequency spectrums C.) broadbands D.) speed limits of signals

A.)

MIMO ________. A.) transmits multiple signals in the same channel B.) bonds two or more channels for higher speed C.) uses a single spatial stream but multiple signals D.) is used in all forms of 802.11

A.)

Optical fiber's main advantage over UTP is ________. A.) greater distance span B.) higher speed C.)lower fragility D.)lower cost

A.)

Physical layer standards govern ________. A.) signaling B.)frame structure C.)both frame structure and signaling D.)neither frame structure nor signaling

A.)

There is an access point that serves eight wireless hosts. On how many channels will these devices transmit and receive during the course of an hour or two? A.) 1 B.) 8 C.) 2 D.) 9

A.)

To handle multiple conversations in radio transmission, you normally use multiple ________. A.) channels B.) frequencies C.) wires D.) service bands

A.)

Untwisting wire pairs no more than 1.25 cm (a half inch) at their ends reduces ________. A.) terminal crosstalk interference B.) none of these C.) crosstalk interference D.) interference

A.)

We use the terms Wi-Fi and ________ interchangeably in this book. A.) 802.11 B.) 802.3 C.) 802.1 D.) 802.1X

A.)

What happens if two nearby access points use the same channel? A.) They will interfere with each other. B.) They will be bonded for joint operation automatically if they are on the same ESS. C.) They will be bonded for joint operation automatically if they have the same SSID. D.) They will be bonded for joint operation automatically.

A.)

What propagation problem becomes worse as frequency increases? A.) none of these B.) inverse square law attenuation C.) electromagnetic interference D.) both inverse square law attenuation and electromagnetic interference

A.)

What propagation problem is especially bad in moist air? A.) absorptive attenuation B.) electromagnetic interference C.) multipath interference D.) inverse square law attenuation

A.)

What type of switch connects switches to other switches? A.) core switches B.) none of these C.) workgroup switches D.) trunk switches

A.)

Which of the following is more efficient and faster? A.) CSMA/CA+ACK B.) RTS/CTS C.) Both are about equally efficient and fast.

A.)

Which of the following is relatively immune to small errors? A.) binary signaling B.) both binary and analog C.) analog signaling D.) neither binary nor analog

A.)

Wi-Fi Standards come from the ________ Working Group. A.) 802.11 B.) 802.3 C.) 802.1 D.) 802.1X

A.)

Wireless access points typically link wireless clients to ________. A.) servers on the wired network B.) wireless servers C.) none of these D.) both wired and wireless servers

A.)

Optical fiber cords use two strands ________. A.) to form a complete electrical loop B.) for full-duplex transmission C.) to double the transmission speed D.) for reliability through redundancy

B.)

The frequency spectrum extends ________. A.) into the gigahertz range B.) to infinity C.) into the visible light range D.) into the ultraviolet range

B.)

The protocol standard for VLANs is _____. A.) None of these B.) 802.1q C.) 802.11a D.) 802.

B.)

The purpose of LLC subheader is to ________. A.) divide the data field from the trailer B.) designate the type of packet in the data field C.) divide the header from the data field D.) permit error detection

B.)

What propagation problem becomes worse as there is a large and dense object between sender and receiver? A.) multipath interference B.) none of these C.) shadow zones or dead zones D.) both multipath interference and shadow zones

C.)

Which UTP quality levels are needed to send signals 100 meters at 10 gigabits per second? A.) both category 6 and category 6A B.) category 6 C.) category 6A D.) neither category 6 nor category 6A

C.)

________ have SSIDs. A.) none of these B.) Wireless clients C.) Wireless access points D.) both Wireless clients and access points

C.)

Ethernet standards are specified at the ________ layer. A.) neither physical nor internet B.) both physical and internet C.) internet D.) physical

D.)

In LANs, ________ typically is for ________. A.) optical fiber, access lines B.) none of these C.) UTP, trunk lines D.) UTP, access lines

D.)

In binary signaling there is (are) ________ state(s). A.) one B.) an infinite number of C.) a number of D.) two

D.)

In optical fiber, light travels through the ________. A.) Neither core nor cladding B.) both core and cladding C.) cladding D.) core

D.)

Select the correct wire map for the EIA/TIA 586B standard, with the connector's tab down and the contacts facing up and away from you. A.) White/Green, Green, White/Orange, Brown, White/Brown, Orange, White/Blue, Blue B.) White/Green, Green, White/Orange, Blue, White/Blue, Orange, White/Brown, Brown C.) White/Orange, White/Green, White/Blue, White/Brown, Orange, Green, Blue, Brown D.)White/Orange, Orange, White/Green, Blue, White/Blue, Green, White/Brown, Brown

D.)

Signals in a transmission usually ________. A.) spread over the entire service band B.) travel at a single frequency C.) spread over the entire frequency distribution D.) spread over a range of frequencies

D.)

Spread spectrum transmission is used in WLANs because ________. A.) none of these B.) it offers strong security C.) it is both required by regulators and it offers strong security D.) it is required by regulators

D.)

The 5 GHz band usually supports about ________ non-overlapping 20 MHz channel(s). A.) 3 B.) 7 C.) 1 D.) 12

D.)

The 802.11 standard has two mechanisms for media access control. One of two mechanisms is mandatory; it is ________. A.) CSMA/CD B.) RTS/CTS C.) MAC D.) CSMA/CA+ACK

D.)

The Ethernet length field gives the length of the ________. A.) frame B.) frame, less the frame check field's size C.) None of these D.) data field

D.)

The longest transmission distances are possible with ________. A.) multimode fiber B.) USB C.) UTP D.) single-mode fiber

D.)

To transmit data very rapidly, you would want a ________ channel. A.) none of the above B.) single-frequency band C.) narrowband D.) broadband

D.)

UTP categories rate the ________ of UTP cabling. A.) error performance B.) thickness C.) color D.) quality

D.)

Under the standard, Ethernet switches can provide enough power over UTP for ________. A.) wireless access points B.) voice over IP telephones C.) neither wireless access points nor voice over IP telephones D.) both wireless access points and voice over IP telephones

D.)

Using VLANs can increase _______ A.) congestion B.) complexity C.) costs D.) security

D.)

Using VLANs can reduce _______ A.) none of these B.) security C.) both congestion and security D.) congestion

D.)

WLANs normally use ________. A.) licensed bands B.) none of these C.) both licensed and unlicensed bands D.) unlicensed bands

D.)

What 802 Working Group creates Ethernet standards? A.) 802.2 B.) 802.1 C.) 802.11 D.) 802.3

D.)

What organization CREATES Ethernet standards? (Give the most specific answer.) A.) OSI B.) ISO C.) IETF D.) IEEE

D.)

Which UTP quality levels can send signals at 10 gigabits per second? A.) category 6 B.)category 6A C.)neither category 6 nor category 6A D.) both category 6 and category 6A

D.)

Which of the following can increase reliability considerably in an Ethernet LAN? A.) using a hierarchical topology B.) using a bus topology C.) using a mesh topology D.) using the Rapid Spanning Tree Protocol

D.)

Which of the following is the newest Wi-Fi standard discussed in the text book? A.) 802.11g B.) 802.11b C.) 802.11n D.) 802.11ac

D.)

Wireless network standards operate at ________. A.) none of these B.) the Internet layer C.) both data link layer and Internet layer D.) the data link layer

D.)