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Information Protocol (RIP)
- RIP is a distance vector routing
- protocol used for routing within an autonomous system (i.e.an IGP).
- RIP uses the hop count as the metric.
- RIP 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.
- RIP v1 is a classful protocol; RIP v2 is a classless
RIP is best suited for small private networks.
Interior Gateway Routing Protocol (EIGRP)
- EIGRP is a hybrid routing protocol
- developed by Cisco for routing within an AS.
- EIGRP uses a composite number for the metric that
- indicates bandwidth and delay for a link. The higher the bandwidth, the
- lower the metric.
- EIGRP is a classless protocol.
- EIGRP is best suited for medium to large private
Open Shortest Path First (OSPF)
OSPF is a link state routing protocol used for routing within an AS.
- OSPF uses a relative link cost for the metric.
- OSPF is a classless protocol.
- OSPF divides a large network into areas.
- Each autonomous system requires an area 0 that
- identifies the network backbone.
- All areas are connected to area 0, either directly
- or indirectly through another area.
- 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
- OSPF is best suited for large private networks.
Intermediate System to Intermediate System (IS-IS)
IS-IS is a link state routing protocol used for routing within an AS.
- IS-IS uses a relative link cost for the metric.
- IS-IS is a classless protocol.
- The original IS-IS protocol was not used for routing IP
- packets; use Integrated IS-IS to include IP routing support.
- IS-IS divides a large network into areas. There is no
- area 0 requirement, and IS-IS 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-IS is best suited for large private networks,
- supporting larger networks than OSPF. IS-IS is typically used within an ISP,
- and easily supports IPv6 routing.
Border Gateway Protocol (BGP)
BGP is an advanced distance vector protocol (also called a path vector protocol). BGP is an exterior gateway protocol (EGP) used for routing between autonomous systems.