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26 Cards in this Set
- Front
- Back
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Backoffalgorithm
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Backoffalgorithms determine when the colliding stations can retransmit.
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CAM
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content addressable memory (CAM) Content addressable memory is an original term used by bridges for MAC addresses held in tables to associate them to an interface. See also: MAC address.
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CRC
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Cyclicredundancy check: A methodology that detects errors, whereby theframe recipient makes a calculation by dividing frame contents with aprime binary divisor and compares the remainder to a value stored inthe frame by the sending node
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Crossover cable
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Typeof Ethernet cable that connects a switch to a switch, a host to ahost, a hub to a hub, or a switch to a hub
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CSMA/CD
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CarrierSense Multiple Access with Collision Detection: A technology definedby the Ethernet IEEE 802.3 committee. Each device senses the cablefor a digital signal before transmitting. Also, CSMA/CD allows alldevices on the network to share the same cable, but one at a time. Iftwo devices transmit at the same time, a frame collision will occurand a jamming pattern will be sent; the devices will stoptransmitting, wait a predetermined amount of time as well as aself-imposed random amount of time, and then try to transmit again.
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DHCP
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DynamicHost Configuration Protocol: DHCP is a superset of the BootPprotocol. This means that it uses the same protocol structure asBootP, but it has enhancements added. Both of these protocols useservers that dynamically configure clients when requested. The twomajor enhancements are address pools and lease times.
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DNS
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DomainName System: Used to resolve hostnames to IP addresses
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FullDuplex
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Thecapacity to transmit information between a sending station and areceiving unit at the same time
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Halfduplex
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Thecapacity to transfer data in only one direction at a time between asending unit and receiving unit.
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Howdoes a switch populate its table?
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Goingfrom one end of the network to the other end and there are routersand switches in between. What happens to frames as they travel?
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Goingfrom one end of the network to the other end and there are routersand switches in between. Whathappens to packets as they travel?
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IEEE802.3 wiring
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Jammingsignal
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Ajam signal informs all devices that a collision occurred.
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OUI
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Shortfor Organizational Unique Identifier, the first 24 bits of a MACaddress for a network-connected device, which indicate the specificvendor for that device.
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Rolledcable
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Typeof wiring cable that is used to connect a PC’s COM port to a routeror switch console port.
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Straight-throughcable
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Typeof Ethernet cable that connects a host to a switch, a host to a hub,or a router to a switch or hub
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VLANs
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VirtualLAN: A group of devices on one or more logically segmented LANs(configured by use of management software), enabling devices tocommunicate as if attached to the same physical medium when they areactually located on numerous different LAN segments. VLANs are basedon logical instead of physical connections and thus are tremendouslyflexible.
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Whatare the features of 1000BaseT
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Category5, four-pair UTP wiring up to 100 meters long and up to 1 Gbps.
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Whatare the features of 10BaseT
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Partof the original IEEE 802.3 standard, 10Base-T is the Ethernetspecification of 10 Mbps baseband that uses two pairs oftwisted-pair, category 3, 4, or 5 cabling—using one pair to senddata and the other to receive. 10Base-T has a distance limit of about100 meters per segment.
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Whatare the features of Ethernet?
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Abaseband LAN specification created by the Xerox Corporation and thenimproved through joint efforts of Xerox, Digital EquipmentCorporation, and Intel. Ethernet is similar to the IEEE 802.3 seriesstandard and, using CSMA/CD, operates over various types of cables at10 Mbps. Also called DIX (Digital/Intel/Xerox) Ethernet. See also:10Base-T, FastEthernet, and IEEE
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Whatare the three layers of Cisco’s management model?
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Core,Distribution, Access
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Whatis in an IP packet header?
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Version,IHL, DSCP, ECN, Total Length, Identification, Flags, Fragment Offset,Time To Live, Protocol, Header Checksum, Source IP Address,Destination IP Address, Options
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Whatis meant by a collision? What causes them? How can you fix thisproblem?
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Theeffect of two nodes sending transmissions simultaneously in Ethernet.When they meet on the physical media, the frames from each nodecollide and are damaged; Send a jamming packet.
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Whatis the high order bit?
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Thehigh-order bit is the Individual/Group (I/G) bit. When it has a valueof 0, we can assume that the address is the MAC address of a deviceand that it may well appear in the source portion of the MAC header.When it’s a 1, we can assume that the address represents either abroadcast or multicast address in Ethernet
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Workgroup
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Thedistribution layer (DOD Model) is sometimes referred to as theworkgroup layer and is the communication point between the accesslayer and the core. The primary functions of the distribution layerare to provide routing, filtering, and WAN access and to determinehow packets can access the core, if needed. The distribution layermust determine the fastest way that network service requests arehandled
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