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21 Cards in this Set
- Front
- Back
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Auto summarize
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Turn off on eigrp. Doesn’tchoose the best path. Manually specify path.
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Checksum
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a digit representing the sum ofthe correct digits in a piece of stored or transmitted digital data,against which later comparisons can be made to detect errors in thedata.
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Default routes
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In computer networking,the defaultroute isa setting on a computer defining thepacket forwarding rule to use when no specific route canbe determined for a given Internet Protocol (IP) destination address.All packets for destinations not established in the routing tableare sent via the defaultroute.
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EIGRP
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In computer networking,the defaultroute isa setting on a computer defining thepacket forwarding rule to use when no specific route canbe determined for a given Internet Protocol (IP) destination address
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Exit interface
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The interface the data leaves
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Gateway of Last Resort
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A Gatewayof Last Resort orDefault gateway isa route used by the router when no other known route exists totransmit the IP packet. Known routes are present in the routingtable. Hence, any route not known by the routing table is forwardedto the default route
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Hardware address
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MAC address
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How does a router with multiplepaths choose the best route?
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Load balancing
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The act of balancing packet loadover multiple links to the same remote network.
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Metric
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Any value that is used by routingalgorithms to determine whether one route is superior to another.Metrics include such information as bandwidth, delay, hop count, pathcost, load, MTU, reliability, and communication cost. Only the bestpossible routes are stored in the routing table, while all otherinformation may be stored in link-state or topological databases.
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Network 0.0.0.0 0.0.0.0
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Allows all addresses in OSPF area
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Next-hop
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This is the IP address of thenext-hop router that will receive packets and forward them to theremote network
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RIP
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Routing Information Protocol: Themost commonly used interior gateway protocol in the Internet. RIPemploys hop count as a routing metric
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Routing protocol
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Routing protocols distributerouting information throughout all routers on a network. By knowingabout all other routers connected to the network, each router candetermine the best path to use to deliver your traffic. Examples ofrouting protocol would be OSPF, RIP, EIGRP or BGP
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Routed protocol
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A routedprotocol isa protocol bywhich data can be routed. Routedprotocol areIP, AppleTalk, and IPX. In this kind of protocols werequire an addressing scheme and subnetting. Addressing scheme willbe used to determine the network to which a host belongs and toidentifying that host on that particular network
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Static routes
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Manually addressed routes
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What is an autonomous system?
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A group of networks under mutualadministration that share the same routing methodology. Autonomoussystems are subdivided by areas and must be assigned an individual16-bit number by the IANA.
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What is split horizon and whatdoes it do?
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Useful for preventing routingloops, a type of distance-vector routing rule where information aboutroutes is prevented from leaving the router interface through whichthat information was received.
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What is the AdministrativeDistance? Which distances exist?
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A number between 0 and 255 thatexpresses the level of trustworthiness of a routing informationsource. The lower the number, the higher the integrity rating.
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Why are packets discarded byrouters?
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The routing table must have anentry for the network 172.16.20.0 or the packet will be discardedimmediately and an ICMP message will be sent back to the originatingdevice with a destination network unreachable message.
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What is the role of a directlyconnected route?
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