Title: Module Seven Quiz
Course: CNT 2001 Computer Networks & Communications > Section: Module 7 LAN Technologies

Q: What is the oldest and most widely used LAN technology in use today?
- Ethernet
- Token Ring
- Arcnet
- ATM
A: Ethernet
If right: Ethernet, one of the oldest and most widely used LAN technologies in use today, was first developed between 1973 and 1975 by a group headed by Xerox. Today, Ethernet cables usually use a RJ-45 connector.

Q: Which wireless encryption is considered the strongest?
- WEP
- WPA Personal
- WPA2 Personal
- WPA2 Enterprise
A: WPA2 Enterprise
If right: Of the available encryption schemesWPA Enterprise and Personal, WPA2 Enterprise and Personal, RADIUS, and WEPWPA2 Enterprise is the strongest.

Q: Which wireless encryption uses digital certificates for encryption?
- WEP
- WPA Personal
- WPA2 Personal
- WPA2 Enterprise
A: WPA2 Enterprise
If right: WPA and WPA2 Enterprise use a digital certificate as an encryption key.

Q: Which wireless mode uses a central WAP?
- centralized
- ad hoc
- infrastructure mode
- WAP wheel
A: infrastructure mode
If right: A wireless network can be something called an infrastructure wireless network, in which WAPs are used to control access to the wireless network. Infrastructure wireless networks are often connected to a larger wired network. Security is better on an infrastructure wireless network than on an ad hoc wireless network.

Q: Which wireless encryption is considered the weakest?
- WEP
- WPA Personal
- WPA2 Personal
- WPA2 Enterprise
A: WEP
If right: Available encryption schemes are WPA Enterprise and Personal, WPA2 Enterprise and Personal, RADIUS, and WEP. Of these options, WEP is the weakest.

Q: How many channels does 802.11g support?
- 1
- 4
- 10
- 14
A: 14
If right: Frequency range is broken up into 22 MHz pieces with a 5 MHz separation between each. This results in the creation of channels, which are basically specific frequency subranges that have been set aside within the larger 2.4 GHz range. This gives 802.11g up to 14 channels it can work with.

Q: Which wireless mode does not use a central WAP?
- ESSID
- ad hoc
- infrastructure mode
- WAP wheel
A: ad hoc
If right: An ad hoc wireless network is formed when a wireless network is composed of only independent wireless computers in which each device participates in forwarding wireless packets. An ad hoc wireless network has no central WAP to monitor and control it. In effect, an ad hoc wireless network is the wireless network version of a peer-to-peer network.

Q: To connect to a wireless network, you would start with what?
- SSID of the wireless router
- MAC address of the wireless router
- password of the wireless router
- IP address of the wireless router
A: SSID of the wireless router
If right: SSID (short for Set Service Identifier) acts as the network name for a particular WAP. If you are using multiple WAPs in the same network, they will all need to have the same SSID. In Linksys WAPs, the SSID can be up to 32 characters long.

Q: What helps protect data that is sent using a wireless network?
- strong authentication
- encryption
- RADIUS
- multiple frequencies
A: encryption
If right: Encryption is where a device such as a computer or a WAP takes the data that it is sending out and first runs an algorithm on it so that it cannot be read without first having the key to read it. This capability increases the security of a network by making it more difficult for an outsider to read what is passing across a network.

Q: Which wireless encryption uses a common password for encryption?
- WPA Enterprise
- WPA Personal
- WPA2 Enterprise
- unsecured
A: WPA Personal
If right: WEP, WPA Personal, and WPA2 Personal use a common password for encryption.

Q: What standard was 1000Base-X introduced as?
- IEEE 802.3a
- IEEE 802.3b
- IEEE 802.5
- IEEE 802.3z
A: IEEE 802.3z
If right: In 1998, 1000Base-X was released under the IEEE 802.3z standard. As the first 1,000 megabit or 1 gigabit Ethernet standard to be released, it is known as Gigabit Ethernet.(GbE).

Q: What distance does 1000Base-LX support with single-mode fiber?
- 400 meters
- 2,000 meters
- 5,000 meters
- 10,000 meters
A: 5,000 meters
If right: When 1000Base-LX was used with multi-mode fiber it could achieve a range of up to 550 meters. When 1000Base-LX was used with single-mode fiber, its range was extended out to as much as 5 km.

Q: What IEEE standard is used for 10 Gigabit Ethernet?
- 802.3a
- 802.3b
- 802.3ae
- 802.3ab
A: 802.3ae
If right: 10 Gigabit Ethernet was first proposed under the IEEE 802.3ae standard in 2003. This standard put forward a number of fiber optics based 10 Gigabit Ethernet solutions. The Ethernet standards proposed under 802.3ae were 10GBase-SR, 10GBase-LR, 10GBase-ER, 10GBase-SW, 10GBase-LW, and 10GBase-EW.

Q: What is the copper version of Gigabit Ethernet?
- 1000Base-T
- 1000Base-X
- 1000Base-FX
- 1000Base-TX
A: 1000Base-T
If right: 1000Base-T is the copper version of Gigabit Ethernet and was standardized in 1999. The standard used for copper-based Gigabit Ethernet was IEEE 802.3ab, which was designed to use CAT 5, 5e, or 6.

Q: What is the range of 100Base-FX running in half-duplex?
- 200 meters
- 400 meters
- 2,000 meters
- 10,000 meters
A: 400 meters
If right: 100Base-FX can be used with both multi-mode fiber and single-mode fiber. 100Base-FX delivers a throughput of 100 mbps in all usage modes. With multi-mode fiber at half-duplex, 100Base-FX has a range of 400 meters.

Q: Which Ethernet standard was developed to work over fiber?
- 10Base-2
- 10Base-5
- 100Base-TX
- 100Base-FX
A: 100Base-FX
If right: 100Base-FX is the version of Fast Ethernet that is intended to be used over fiber-optic cable. Introduced at the same time as 100Base-TX, 100Base-FX was part of the same IEEE 802.3y standard.

Q: What is the range of 100Base-FX running in full-duplex on multi-mode fiber?
- 200 meters
- 400 meters
- 2,000 meters
- 10,000 meters
A: 10,000 meters
If right: When 100Base-FX is used with single-mode fiber instead of multi-mode fiber, it needs to be used at full duplex but its range increases to 10,000 meters, or 10 km.

Q: What is the range for 100base-FX running in full-duplex on single-mode fiber?
- 200 meters
- 400 meters
- 2,000 meters
- 10,000 meters
A: 2,000 meters
If right: With multi-mode fiber at half-duplex, 100Base-FX has a range of 400 meters. If you shift from half-duplex to full-duplex, 100Base-FXs range increases to 2,000 meters or 2 km.

Q: What is another term for link bonding?
- link aggregation
- port adaptation
- RAID
- Network expansion
A: link aggregation
If right: If Ethernet connections are being bonded, it is called Ethernet bonding. If links are being bonded, it is called link aggregation.

Q: How many collision domains does an eight-port hub have?
- 1
- 2
- 8
- 9
A: 1
If right: The single collision domain is formed because all the computers are connected to a single hub. A hub works much like a bus topology, so all computers connected together via one or more hubs form a single collision domain.

Q: What technology is usually used with wireless technology that will limit who can connect to a wireless network?
- SSID broadcasting
- SSID filtering
- IP address filtering
- MAC address filtering
A: MAC address filtering
If right: You would want to enable MAC address filtering if you want to make your wireless network as secure as possible. MAC filtering means that only preprogrammed MAC addresses are allowed access to a specific WAP.

Q: How many meters can Category 5 cable reliably carry 100 mbps of data.
- 25
- 50
- 100
- 200
A: 100
If right: CAT 5 cable can carry 100 mbps of data 100 meters before the data needs to be regenerated by some device such as a switch.

Q: What do you call data that is sent to all computers on a network or network segment?
- collision
- broadcast
- unicast
- multicast
A: broadcast
If right: A broadcast is where a computer sends data across a network by sending the data frame containing the data to all computers directly connected to it on a local network. Ethernet is a broadcast-based network technology

Q: What 10 Gigabit Ethernet standard supports either shielded or unshielded twisted-pair wiring?
- 10GBase-T
- 10GBase-TX
- 10GBroad-T
- 10GBroad-TP
A: 10GBroad-T
If right: 10GBase-T is the version of 10 Gigabit Ethernet that can use either shielded or unshielded twisted-pair wiring. This particular standard was formalized in the IEEE 802.3an standard in 2006.

Q: Which of the following is considered a legacy device?
- hub
- switch
- router
- gateway
A: hub
If right: A hub has been replaced by the switch. In modern networks where switches are used instead of hubs, collisions are very rare.

Q: Which type of device reads the MAC address of the destination and sends it to the port where the destination host is?
- hub
- router
- switch
- gateway
A: switch
If right: When a frame is released from a computer onto the network, the first device that sees the data frame is a switch. A switch reads the MAC or physical destination address of a data frame. As soon as the switch knows what the destination physical address of a specific frame is, it links the port with the physical address of the source computer directly to the port with the physical address of the destination computer. As a result, a direct connection is made between the two computers that no other computer connected to the switch can take over.

Q: What happens when two computers broadcast at the same time on the network, causing both sets of data to be garbled?
- crash
- EMI
- EFI
- collision
A: collision
If right: When two different computers need to send data at the same time, they will listen to the network. If neither computer hears any activity on the network, they both will conclude that they are clear to send data at that time. As a result, both computers end up sending data packets simultaneously; however, because only one data packet can be on the network cable at one time, a collision occurs. The collision results in a slight power spike on the network as well as destruction of the data in the two packets.

Q: When a collision occurs, what do the two sending nodes do?
- They both wait a random amount of time and try again.
- The computer on the right goes first.
- The nearest computer goes first.
- They immediately try again.
A: They both wait a random amount of time and try again.
If right: When computers on the network segment “hear” a collision on the network, they all immediately activate something called a hold-down timer. This timer is effectively a clock that activates in each NIC on the network and starts counting down from a randomly set point of time. While the clock on a particular NIC is counting down, it cannot send any packets. As each computer on the network segment finishes its random countdown, it can begin listening to the network again to find an open point where it can begin to send its data packet.

Q: What type of device will reduce the number of collisions?
- gateway
- proxy server
- hub
- switch
A: switch
If right: Switches, when running in full-duplex, were developed to eliminate collisions almost completely. By prescreening each frame released on a network, a switch can set up a dedicated circuit between the source computer and the destination computer.

Q: What media type can carry multiple data signals at the same time?
- baseband
- broadband
- singleband
- multiband
A: broadband
If right: Baseband means is that a cable can carry only one signal one way at one time. In the case of most modern Ethernet cables, this means that there is one line for sending signals and another line for receiving signals inside an Ethernet cable.

Q: What type of cable would you use if you need to go long distances of a couple of kilometers?
~ Unshielded twisted-pair (copper) cable can transmit data reliably up to 100 meters. If you need to go further than 100 meters, you need to use fiber cabling.

Q: How many wires or separate strands do you need to use full duplex for 100Base-FX?
~ If 100Base-FX is used in full-duplex mode, two fiber wires are needed: one for transmitting and the other for receiving.

Q: What is the abbreviation of megabits per second?
~ Network speed is actually the measure of how much data can move through the network in a given amount of time. This is referred to as kilobits per second (kbps) which stands for thousands of bits per second; megabits per second (mbps), which stands for millions of bits per second; and sometimes gigabits per second (gbps), which stands for billions of bits per second.

Q: You live in an apartment building. Several occupants within the building have their own wireless networks. What can you so that you wireless network can coexist with the other occupants?
~ Using different channels means there can be no overlap. Unfortunately, with 22 MHz channel ranges—and only 5 MHz between the start of one channel and the start of the next—there is a lot of overlap. Although there may be 14 channels available for 802.11g, only three of those channels can be used effectively and not have overlap.

Q: A ________ is a single 1 or 0 of network data.
A: bit
If right: A bit is a single 1 or 0 of network data. Many 1s or 0s can be sent across a network connection at that time.

Q: Typically for the best range, you want to place a WAP __________ within your office building.
A: centrally
If right: With wireless access points, keep in mind that the further your computer is from the access point, the slower the data throughput will be for your computer. When using a single access point, you want to locate it as centrally as possible in relationship to where your computers are located.

Q: Which type of cabling is the most resistant against EMI?
~ Copper cabling uses electrical signals to send data, which is susceptible to electromagnetic interference. Therefore, to avoid EMI, you use fiber cabling.

Q: __________ is using two or more NICs, channels, or connections to push data through instead of just one.
A: Bonding
If right: Bonding seems like an odd networking term, but it is a valid technique used in networking to increase network throughput. In simple terms, bonding means data is pushed through two or more NICs, channels, or connections, instead of just one.