Chapter 7
Wireless LANs are never connected to a wire network. True False
False
Wireless LANs use Carrier Sense Multiple Access with Collision Detection (CSMA/CD) for medic access control. True False
False
________ is a hybrid version of Ethernet that uses either 10Base-T or 100Base-T. Mullion Ethernet Base-T Ethernet 10/100 Ethernet Token ring Ethernet FDDI Ethernet
10/100 Ethernet
IEEE 802.11ac runs on which of the following two different frequency spectrums simultaneously? 2.4GHz and 5GHz 24GHz and 5GHz 11GHz and 54GHz 8GHz and 11GHz 2.4GHz and 11GHz
2.4GHz and 5GHz
The maximum data rate of an 802.11g WLAN is 24 Mbps 36 Mbps 11 Mbps 54 Mbps 9 Mbps
54 Mbps
How many channels does the 802.11ac standard provide for communication between the access point and clients? 4 6 8 11 2
8
802.11g is backward compatible with which type of LAN? 802.11a 802.11b 802.15 802.3 802.5
802.11b
The IEEE designation for the type of wireless standard that uses both the 2.4 and 5 GHz range is __________. 802.11n 802.11a 802.3 802.11b 802.11g
802.11n
Which of the following is not a WLAN standard? 802.11ac 802.11a 802.3 802.11b 802.11g
802.3
The maximum transmission speed of 802.11a LANs is 11 Mbps. True False
False
The three latest versions of Ethernet run at speeds of 1Gbps, 10Gbps, and 50 Gbps. True False
False
CSMA/CA is an acronym for: Carrier Sense Multiple Access with Collision Acknowledgment Carrier Sense Mode Access with Carrier Avoidance Carrier Sense Multiple Access with Collision Avoidance Carrier Sensory Multiple Access without Collision Acknowledgment Carrier Sense Multiple Acknowledgment with Collision Avoidance
Carrier Sense Multiple Access with Collision Avoidance
Wi-Fi Protected Access (WPA) uses the same key for every packet that is transmitted to the client. True False
False
_____________ provide information about resources on the network that are available to the users, such as shared printers, file servers and application software. Network Services Directory Services Client Services Computing Services Remote Access Services
Directory Services
802.11b is a faster wireless standard than 802.11a. True False
False
A switch always broadcasts all the packets it receives to all the computers that are connected to the switch. True False
False
Cut through switching has fewer errors than store and forward switching. True False
False
Ethernet is a layer 3 protocol, which operates at the network layer. True False
False
LANs that run on radio frequencies use a type of wired media. True False
False
Store and forward switching cannot be used unless incoming and outgoing data circuit has the same data rate. True False
False
The DCF function of Wi-Fi resolves the hidden node problem. True False
False
The Network Interface Card (NIC) permits a computer to be physically connected to a network's cable, which provides the network layer connection among the computers in the network. True False
False
Which of the following is not true about CSMA/CD? The acronym refers to Carrier Sense Multiple Access with Collision Detection It is used in token ring protocol LANs It is a contention-based media access control technique When a collision has occurred, the computers that wish to transmit wait a random amount of time after a colliding message before attempting to retransmit Computers on the circuit 'listen' before transmitting
It is used in token ring protocol LANs
_________ is not a type of Ethernet specification. 100Base-T 10GbE 1000Base-T (1GbE) 10Base-T Securenet
Securenet
____ is the process of creating several logically separate servers on the same physical computer. Server virtualization Server optimization Server proliferation Server platforming Server redundancy
Server virtualization
A switch uses a _____________ that is very similar to a routing table used in a router. cable plan forwarding table network server reversing table switching mullion
forwarding table
Which of the following is not true about layer-2 switched Ethernet? A switch replaces the hub. The physical topology is the same as the physical topology of shared Ethernet: a ring. The logical topology is a star. The switch uses a forwarding table to route the packet to the correct circuit/computer. The switch chooses which packet to transmit first if it receives more than one packet destined for the same computer at the same time, and stores the other packet(s) temporarily.
The physical topology is the same as the physical topology of shared Ethernet: a ring.
Which of the following is a mode in which a switch operates: fast learning switching routing switching fragment-free switching store switching cut switching
fragment-free switching
802.11a provides for speeds of up to 54 Mbps under perfect conditions. True False
True
A forwarding table tells a switch which port it should send out a packet to get to the destination computer. True False
True
An access point (AP) is required to connect a WLAN to a wired network. True False
True
Directional antennas signals are much stronger than omnidirectional antennas. True False
True
It takes 802.11a more access points to provide the same coverage as one 802.11b access point. True False
True
Many network hubs incorporate repeaters or amplifiers to regenerate signals so that attenuation of the signal does not occur. True False
True
Network profile refers to what resources on each server are available on the network for use by other computers and which devices or people are allowed access on the network. True False
True
One of the most important functions of Network Operating System (NOS) is a directory service. True False
True
The frequency ranges of some access points are the same as some cordless telephones. True False
True
Traditional Ethernet is also known as shared Ethernet. True False
True
When a switch receives a packet with a destination address that is not in its forwarding table, the switch will broadcast the packet to all of its ports. True False
True
Wired Equivalent Privacy requires that each user have a preconfigured key in order to communicate with an access point. True False
True
A second type of network that a wireless access point provides is a ______ that is secured by a separate password that is entered on a Web page when you first connect to the network. WI-LO network guest network transient network IEEE 802.temp IEEE 802.11guest
WI-LO network
10Base-T: supports 10 Mbps data rate is inexpensive runs on twisted pair is more dominant than token ring all of the answers are correct
all of the answers are correct
Which of the following is not a potential bottleneck for LAN performance? number and speed of hard disks in the server amount of memory in the server speed of server's CPU network interface card all of the answers are potential bottlenecks for LAN performance
all of the answers are potential bottlenecks for LAN performance
How can a set of 802.11b access points be configured to operate without interference? assigning each access point a different channel to communicate with clients separate each access point by more than 10 meters assign the same channel to no more than two access points use omnidirectional antennas on some access points and directional on others. none of the above
assigning each access point a different channel to communicate with clients
1000 Base-T: can run at either full- or half-duplex is one of the oldest forms of Ethernet is one of the slowest forms of Ethernet can only be used over coaxial cables has only one version, 1000Base-SLCX
can run at either full- or half-duplex
A(n) _____________ is not a common type of dedicated server. file server print server database server collision server remote access server
collision server
Media access control refers to: the price of fiber optic cable security over floppy disks in a user environment the ability for a user to use multimedia equipment in a LAN controlling access to a media by more than one computer in a LAN the control over coax cable installed by a cable service provider
controlling access to a media by more than one computer in a LAN
__________ antennas project a signal in only one direction and are most often used on the inside of an exterior wall pointing to the inside of the building for security reasons. directional microware omnidirectional radio vertical
directional
The cheapest time to install network cabling is: during the construction of the building as soon as the building is completed as soon as the building is occupied about five years after the building is occupied so that the exact office locations for each network computer is known any time that a network needs to be installed
during the construction of the building
A(n) ____________ allows many users to share the same set of files on a common, shared disk drive. print server database server file server piconet server remote access server
file server
A hierarchical tree of domains within one organization that is linked to other trees in the organization is called a ___________. ADS domain forest tree NDS
forest
The ________ acts as a router at the front of the server farm. load router MDF Layer 2 switch front-end loader load balancer
load balancer
A __________ indicates what resources on each server are available on the network for use by other computers and what people are allowed what access to the network. user profile user access log network profile network operating system server allocation list
network profile
Another name for distributed coordination function (DCF) is __________. distributed carrier sense method physical carrier sense method physical carrier sense mode distributed carrier sense mode distributed coordination mode
physical carrier sense method
Each of the circuits connected to a switch is a separate _______________ circuit connecting the switch to a device on the network. multipoint point-to-point shared ring star
point-to-point
Breaking a network into smaller parts is called network: fragmentation segmentation localization allocation mitigation
segmentation
A ___ has a set of high-speed storage devices and servers that are networked together using a very high speed network. wide area network local area network storage area network storage server local area storage WAN
storage area network
Which of the following is not determined by a site survey? feasibility of the desired coverage potential sources of interference the security of the WLAN estimated number of access points needed to provide coverage current locations of the wired network into which the WLAN will connect.
the security of the WLAN
Which of the following is not a purpose for using hubs in a network? to act as a communications server to connect network cables to prevent attenuation to act as a junction box none of the above
to act as a communications server
To increase the volume of simultaneous messages the LAN circuit can transmit from network clients to the server(s), you can: increase the CPU of the server upgrade to a bigger circuit increase the number of hard disks on the server increase the amount of disk capacity of the server increase the amount of memory of the server
upgrade to a bigger circuit
