Term
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Definition
| Supports 1000 Mbps Ethernet (usually called 'gigabit ethernet') Over category 5 or higher UTP cable using baseband signalling |
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Term
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Definition
| 100 Mbps ethernet using baseband signalling over two strands of fiber-optic cabling. |
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Term
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Definition
| It's the most commonly used Ethernet variety today. It runs over category 5 or higher UTP cable and uses two of the four wire pairs; one to transmit data and the other to receive it. It runs at 100Mbps, using baseband signaling. |
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Term
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Definition
| Ethernet running at 10Mbps, using baseband signaling over category 3 or higher twisted pair cabling. Only used in older networks |
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Term
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Definition
| 10 Gigabit ethernet running over 4 pair of category 6A UTP cabling, using baseband signaling. Only runs in full duplex mode. |
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Term
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Definition
| Also called 'peer to peer mode', it's a wireless mode of operation typically used only in small or temporary installations. There's no central device and data travels from one device to another to reach the destination device. Huge security issues. |
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Term
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Definition
| The weakening of a signal as it travels across network media. |
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Term
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Definition
| A type of signaling used in networks, in which each bit of data is represented by a pulse of electicity (on copper) or light (on fiber). These signals are sent at a fixed frequency, using the mediums entire bandwidth. LAN technologies use baseband signaling. |
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Term
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Definition
| A type of signaling that uses analog technologies to encode binary 1's and 0's across a continous range of values. Broadband signals move across the medium in the form of continouos electromagnetic or optical waves rather than discrete pulses. Signals flow at a particular frequency and each frequency represents a channel af data. Allowing multiple streams of data on a single wire. TV and cable internet use broadband signaling. |
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Term
| Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) |
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Definition
| An access control method used by Wi-Fi networks, in which acknoledgement is required for every packet sent, thereby avoiding most possibilities of a collision. (collision avoidance) |
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Term
| Carrier Sense Multiple Access with Collision Detection (CSMA/CD) |
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Definition
| A media access method in which a device must first listen (carrier sennse) to the mediume to be sure no other device is transmitting. If two devices transmit at the same time (multiple access), a collision occurs and is detetected (collision detection). In this case, all devices involved in the collision wait for a random period of time before transmitting again. |
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Term
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Definition
| The result of two or more devices on the same medium transmitting simultaneously when the CSMA/CD is the media access method in use. |
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Term
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Definition
| The extent to which signals in an ethernet bus topology network are propagated. All devices connected to a logical bus topology network are in the smae collision domain. Switch and router ports delimit collision domains. |
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Term
| Cyclic Redundancy Check (CRC) |
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Definition
| The error checking code in an ethernet's frame trailer; it's the result of a mathematical algorithm computed on the frame data. When the destination device receives the frame, the calculation is repeated. If the results of this calculation don't match the CRC in the frame, it indicates the data was altered in some way. (Similar to MD5 hashing?) |
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Term
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Definition
| An extension of the physical star topology, in which a central switch or hub is the central connecting point for other switches or hubs that have computers and other network devices attached, forming a star of stars. |
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Term
| FIber Distributed Data Interface (FDDI) |
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Definition
| A technology that uses the token-passing media access method and dual ring for redundancy. The rings on an FDDI network are usually a physical ring of fiber-optic cable. FDDI transmits at 100Mbps and can include up to 500 nodes over a distance of 100 kilometers. (Rarely used today) |
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Term
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Definition
| The ACTUAL application-to-application data transfer speed |
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Term
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Definition
| A public Wi-Fi network that can usually be accessed without an encryption or authentication code. |
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Term
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Definition
| An operational mode for Wi-Fi networks, in which wireless stations connect through a wireless access point before they can begin communicating with other devices. |
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Term
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Definition
| The path data travels between computers on a network. The most common logical topololgies are switched, bus and ring. |
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Term
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Definition
| A set of rules governing how and when the network medium can be accessed for transmission. The rules ensure that data is transmitted and received in an orderly fashion, and all stations have an opportunity to communicate. Also called the 'media access control'. |
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Term
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Definition
| A topology in which each device in the network is connected to every other device, providing multiple pathways in the event of a device or cable failure. |
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Term
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Definition
| Signals that are copied because of the reflection and scattering and arrive at the receiver at different times. |
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Term
| Mulitple-input/mulitple-output (MIMO) |
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Definition
| An antenna technology that uses multiple antennas to process more than one stream of data. |
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Term
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Definition
| Uses a process called beamforming to send data to multiple clients simultaneously. |
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Term
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Definition
| The cabling used to communicate between LANS or between hubs or switches. The backbone cabling often runs at a faster speed than the cabling used to connect computers because the backbone must carry data from many computers to other parts of the network. (Often fiber cable is used) |
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Term
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Definition
| An antenna technology in which signals radiate out from the antenna with equal strength in all directions. |
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Term
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Definition
| The amount of information in a network transmission (headers, acknowledgements, retransmissions) that ISN'T part of the application data. |
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Term
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Definition
| A network topology in which a continous length of cable connects one computer to another in daisy-chain fashion. There's no central interconnecting device. (Obsolete now) |
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Term
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Definition
| A cabling arrangement in which each device is connected to another device in daisy-chain fashion, and the last device connects back to the first device forming a ring. Used by token ring and FDDI, the physical ring is rarely used now. |
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Term
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Definition
| A network topology that uses a central device, such as a hub or switch, to interconnect computers into a LAN. Each computer has a single length of cable going from it's NIC to the central device. It's the most common physical topology in LANs today. |
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Term
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Definition
| The arrangement of cabling and how cables connect one device to another in a network. The most common physical topology is a star, but bus, ring, point-to-point and mesh topologies are also used. |
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Term
| Point-to-Multipoint (PMP) topology |
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Definition
| A topology in which a central device communicates with two or more other devices and all communication goes through the central device. It's often used in WANs where a main office has connections to several branch offices via a router. |
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Term
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Definition
| A topology in which cabling creates a direct link between two devices; used most often in WANs or in wireless networks to create a wireless bridge. |
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Term
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Definition
| The result of electricity bouncing off the end of a cable and back in the other direction. It causes corruption of data as the bouncing signal collides with signals behind it. A terminator at each cable end is needed to prevent signal bounce. Also called reflection. |
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Term
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Definition
| Signals traveling across a medium and through any connectors and connecting devices until the signal weakens enough to be undetectable or is absorbed by a termination device. |
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Term
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Definition
| A ratio that measures the amount of valid signal compared with the amount of noise in a network transmission. |
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Term
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Definition
| An electrical component called a 'resistor' placed at the ends of a physical bus network to absorb the signal instead of allowing it to bounce back up the wire. |
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Term
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Definition
| The actual amount of data transferred, not counting the errors and ackowledgements. |
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Term
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Definition
| A technology based on the IEEE 802.5 standard; it's cabling is in a physical star topology, but functions as a logical ring. It uses the token-passing media access method, only the computer holding the token can send data. |
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Term
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Definition
| An antenna technology in which signals are focused in a single direction. |
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Term
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Definition
| An operational mode of wireless networking usually used to connect to wired LANs that are separated from each other in such a way that using physical media is impractitcal. Can also be used to extend the reach of a wireless network. |
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Term
| Wireless Fidelity (Wi-Fi) |
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Definition
| The name given to the 802.11 series of IEEE standards that define five common varieties of wirelss LANs: 802.11a, 802.11b, 802.11g, 80211n and 802.11ac. |
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Term
Which of the following describes the arrangement of network cabling between devices?
a. Logical Topology
b. Networking Topology
c. Physical Topology
d. Media access method |
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Definition
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Term
Which of the following is an advantage of star topology? (Choose all that apply.)
a. Allows faster technologies than a bus does
b. Requires less cabling than a bus
c. Centralized monitoring of network |
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Definition
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Term
Which of the following is an example of a technology using a physical ring topology?
a. Token Ring
b. FDDI
C. ADSL
D. IEEE 802.5 |
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Definition
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Term
Which Technology is likely to be implemented as a point-to-point physical topology?
a. Wi-Fi infrastructure mode
b. FDDI
c. Ethernet
d. Wireless Bridge |
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Definition
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Term
Which of the following describes a hub-based Ethernet network?
a. Physical bus
b. Logical bus
c. Physical switching
d. Logical star |
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Definition
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Term
Which best describes a typical wireless LAN?
a. Logical ring topology
b. Logical switching topology
c. Logical bus topology
d. Logical star topology |
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Definition
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Term
Which of the following is a characteristic of a switched logical topology. (choose all that apply)
a. Uses a physical bus topology
b. Creates dynamic connections
c. Sometimes called a shared-medi topology
d. Uses a physical star topology |
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Definition
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Term
Which of the following is a characteristic of unshielded twisted-pair cabling? (choose all that apply)
a. consists of four wires
b. Commonly used is physical bus topologies
c. Has a distance limitation of 100 metres
d. Susceptible to electrical interference |
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Definition
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Term
Which of the following is a characteristic of fiber-optic cabling? (choose all that apply)
a. Can be used in electrically noisy environments
b. Requires only a single strand of fiber for network connections
c. Carries data over longer distances than UTP does
d. Lower bandwidth capacity |
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Definition
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Term
Which topology most likely uses coaxial cabling?
a. Physical star
b. Logical ring
c. Physical bus
d. Logical switching |
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Definition
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Term
Which of the following is true of a MAC address?
a. All binary 1s in the source address indicates a broadcast frame.
b. It's sometimes called a logical address
c. A destination address of 12 hexacdecimal F's is a broadcast
d. It's composed of 12 bits |
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Definition
| c. A destination address of 12 hexacdecimal F's is a broadcast |
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Term
Which of the following is the most commonly used Ehternet frame type?
a. Ethernet II
b. Ethernet SNAP
c. Ethernet 802.3
d. Ethernet 802.2 |
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Definition
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Term
Which of the followiing is a fields of the most common Ethernet frame type? (choose all that apply)
a. ARP trailer
b. FCS
c. Destination MAC Address
d. Data
e. MAC type |
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Definition
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Term
Which access method uses a 'listen before sending' strategy?
a. Token Passing
b. CSMA/CD
c. Token bus
d. Polling |
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Definition
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Term
Which of the following is true about a full-duplex ethernet? (choose all that apply)
a. Stations can transmit and reveive but not at the same time
b. Collision detection is turned off
c. It's possible only with switches
d. It allows a physical bus to operate much faster |
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Definition
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Term
Which of the following is defined by the extent to which signals in an ethernet bus topology network are propagated?
a. Physical domain
b. Collision domain
c. Broadcast domain
d. Logical domain |
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Definition
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Term
Which of the following is considered a property of Ethernet? (choose all that apply)
a. Scalable
b. Best-effort delivery system
c. Guaranteed delivery system
d. Obsolete technology |
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Definition
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Term
Which of the following is true of IEEE 802.3an?
a. Requires two pairs of wires
b. Uses Category 5 or higher cabling
c. Currently best for desktop computers
d. Operates only in full-duplex mode |
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Definition
| d. Operates only in full-duplex mode |
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Term
Which of the following is a feature of 100BaseFX (choose all that apply)
a. Often used as backbone cabling
b. Best when only short cable runs are needed
c. The fastest of the ethernet standards
d. Uses two strands of fiber |
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Definition
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Term
Which Wi-Fi standard can provide the highest bandwidth?
a. 802.11a
b. 802.11b
c. 802.11n
d. 802.11g |
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Definition
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Term
Which of the following is true about infrastructure mode in wireless networks? (choose all that apply)
a. Best used as temporary networks
b. Uses a central device
c. Resembles a physical bus and logical ring
d. Most like a logical bus and physical star |
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Definition
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Term
How many channels can be used on an 802.11b network in North America?
a. 7
b. 9
c. 11
d. 13 |
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Definition
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Term
Which media access method does Wi-Fi use?
a. CSMA/CD
b. Token bus
c. Demand priority
d. CSMA/CA |
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Definition
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Term
Which of the following is true about token ring technology? (choose all that apply)
a. It uses physical ring topology
b. All computers have equal access to the media
c. It uses RTS/CTS signaling before transmission can occur
d. Only the computer with the token can transmit data. |
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Definition
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Term
Which topology is likely to be deployed in a WAN where there's a central offica and three branch offices, AND you all the traffic to from the branches to go through the central office network?
a. Ring
b. PMP
c. Mesh
d. Point-to-Point |
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Definition
| b. PMP also called Point to Multipoint |
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Term
You're configuring a WLAN in a long narrow ballroom. The only place you can put the AP is at the far end of the room. Which type of antenna should you use?
a. Unidirectional
b. Bidirectional
c. Omnidirectional
d. Semidirectional |
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Definition
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Term
Which type of Wi-Fi signal interferance is most likely to be caused by leaves on trees?
a. Diffraction
b. Reflection
c. Refraction
d. Scattering |
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Definition
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Term
Which Wi-Fi standard uses beamforming to allow an AP to send data to multiple devices simulataneously?
a. 802.11ac
b. 802.11n
c. 802.11a
d. 802.11g |
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Definition
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