Term
| Do routers need any configuration information to learn about directly connected networks? |
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Definition
| No. Routers automatically learn about directly connected networks |
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Term
| What is a static default route? |
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Definition
| A the route a router takes for forwarding packets to unknown networks. Its static because its manually configured by Administrators |
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Term
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Definition
| Used by a router to share information in its routing table with routers accessable through that interface. Each interface of a router needs a routing protocol associated with it. |
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Term
| Interior Gateway Protocol (IGP) |
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Definition
| A class of routing protocols used to share routing information between routers within an Autonomous System |
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Term
| Exterior Gateway Protocol (EGP) |
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Definition
| A class of routing protocols used to share information between routers of different Autonomous Systems |
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Term
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Definition
| Indicates the number of routers which must be traversed (travelled through) to reach the destination network. |
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Term
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Definition
| value assigned to the path between hops which is based on the speed or bandwidth of the connection ( ie. 56kbps, 100Mbps, etc). The smaller the value the faster the connection. |
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Term
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Definition
| Value assigned by the Network Administrator to determine the best route to destination networks. Sometimes called the "relative". |
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Term
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Definition
| In this sharing method every router on the network shares its entire routing table with its directly connected neighbor routers. Routers share and update their routing tables at every "Update Interval". Best for smaller networks |
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Term
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Definition
| In this sharing method, routers only share information about directly connected networks, as opposed to its entire routing table. Once convergence is accomplished, updates only contain changes instead of entire routing tables. Best for large networks or sharing routes over a WAN |
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Term
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Definition
| method combines characteristics of both the distance vector and link state Sharing method. It shares its full routing table at startup, followed by partial updates when changes occur. |
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Term
| Routing Information Protocol (RIP) |
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Definition
is a distance vector routing protocol used for routing within an autonomous system (i.e.an IGP).
• uses the hop count as the metric.
• networks are limited in size to a maximum of 15 hops between any two networks. A network with a hop count of 16 indicates an unreachable network.
• v1 is a classful protocol; v2 is a classless protocol.
is best suited for small private networks.
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Term
| Enhanced Interior Gateway Routing Protocol (EIGRP) |
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Definition
is a hybrid routing protocol developed by Cisco for routing within an AS.
• uses a composite number for the metric that indicates bandwidth and delay for a link. The higher the bandwidth, the lower the metric.
• is a classless protocol.
is best suited for medium to large private networks.
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Term
| Open Shortest Path First (OSPF) |
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Definition
is a link state routing protocol used for routing within an AS.
• uses a relative link cost for the metric.
• is a classless protocol.
• divides a large network into areas.
o Each autonomous system requires an area 0 that identifies the network backbone.
o All areas are connected to area 0, either directly or indirectly through another area.
o Routes between areas must pass through area 0.
• Internal routers share routes within an area; area border routers share routes between areas; autonomous system boundary routers share routes outside of the AS.
• A router is the boundary between one area and another area.
is best suited for large private networks.
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Term
| Intermediate System to Intermediate System (IS-IS) |
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Definition
is a link state routing protocol used for routing within an AS.
• uses a relative link cost for the metric.
• is a classless protocol.
• The original protocol was not used for routing IP packets; use Integrated to include IP routing support.
• IS-IS divides a large network into areas. There is no area 0 requirement, and provides greater flexibility than OSPF for creating and connecting areas.
• L1 routers share routes within an area; L2 routers share routes between areas; an L1/L2 router can share routes with both L1 and L2 routers.
• A network link is the boundary between one area and another area.
is best suited for large private networks, supporting larger networks than OSPF.
Is typically used within an ISP, and easily supports IPv6 routing. |
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Term
| Border Gateway Protocol (BGP) |
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Definition
is an advanced distance vector protocol (also called a path vector protocol). is an exterior gateway protocol (EGP) used for routing between autonomous systems.
• uses paths, rules, and policies instead of a metric for making routing decisions.
• is a classless protocol.
is the protocol used on the Internet: ISPs use to identify routes between ASs. Very large networks can use internally, but typically only share routes on the Internet if the AS has two (or more) connections to the Internet through different ISPs. |
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