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What factor does the Cisco implementation of OSPF use to pick the best route?
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What is OSPF adjacencies?
OSPF is a link-state routing protocol that helps Routers exchange IP routes. OSPF Adjacencies is the established "neighborship" between two OSPF routers in order to make the exchange of routes. In this case, Adjacency means the same as "peering", that the OSPF speakers (routers) are able to "talk" to each other.
What OSPF packets will trigger the reset of the Dead Time counter?
packets
Compare and contrast the advertisements by RIP and OSPF?
RIP is an Interior Gateway Protocol and the most widely accepted routing protocol. It is also known by the name of the Unix daemon program routed. RIP is straightforward: it arranges to have routers to broadcast their entire current routing database periodically OSPF is a link-state algorithm. OSPF specifies a class of messages called link-state advertisements (LSAs) that allow routers to update each other about the LAN and WAN links to which they are connected. When a change is made to the network, LSAs flow between routers. OSPF routers receive link-state updates and store them in a topology database in memory. OSPF networks as an end-station-to-router protocol. OSPF addresses all the deficiencies of RIP, without affecting connectivity to RIP based networks.
What is transit area in ospf?
Transit Area: area through which Virtual Links is configured
What is the maximum number of hops that OSPF allows before marking a network as unreachable?
255
Which internal routing protocol would use if you needed to route between Cisco and non-Cisco equipment?
Open standard protocols: Rip or OSPF. They are not Cisco proprietary protocols.
What command injects a default route into an OSPF network?
CCNA Guide to Cisco Networking Fourth Edition Ch.8 Answer: OSPF is configured using the router ospf [process id] command.
What does the Cisco IOS use to calculate the OSPF cost to a destination network?
OSPF stands for open shortest path first. OSPF is an exterior routing protocol. OSPF uses Path vector routing algorithm.
Should EIGRP only be run on networks with Cisco equipment?
EIGRP is a Cisco proprietary routing protocol and therefore can only be used with Cisco routers.You can do route redistribution on Cisco routers, this allows you to take routes from another routing protocol (such as OSPF or RIP) and place them into the EIGRP network that way downstream nodes can be informed of routes available.
How many types of LSAs does OSPF support?
5 types Internetworking with Cisco and Microsoft Technologies pg. 307
Which of is predetermined by an administrator and does not require a routing algorithm?
ospf and static route
What are the key characteristics of OSPF?
OSPF has the following features:Fast Convergence OSPF can detect and propagate topology changes faster than RIP. Count-to-infinity does not occur with OSPF.Loop-Free Routes OSPF-calculated routes are always loop-free.Scalability With OSPF, an AS can be subdivided into contiguous groups of networks called areas. Routes within areas can be summarized to minimize route table entries. Areas can be configured with a default route summarizing all routes outside the AS or outside the area. As a result, OSPF can scale to large and very large internetworks. In contrast, RIP for IP internetworks cannot be subdivided and no route summarization is done beyond the summarizing for all subnets of a network ID.Subnet Mask Advertised with the Network OSPF was designed to advertise the subnet mask with the network. OSPF supports variable-length subnet masks (VLSM), disjointed subnets, and supernetting.Support for Authentication Information exchanges between OSPF routes can be authenticated.Support for External Routes Routes outside of the OSPF AS are advertised within the AS so that OSPF routers can calculate the least cost route to external networks.
What factor is not considered when OSPF determines the best path for a packet?
number of hops
What is an autonomous system and what routing protocols operate within an autonomous system?
An autonomous system is a group of networks under the same management domain using an interior gateway protocol such as OSPF. Internetworking with Cisco and Microsoft Technologies pg. 308 Interior gateway protocols: IGRP, RIP, OSPF, EIGRP Internetworking with Cisco and Microsoft Technologies pg.295-296
What comment are use to delete a routing protocols in cisco router?
No router eigrp <AS #> No router ospf <process ID> No router bgp <AS #> No router rip
What does DR and BDR stand for in Cisco IOS?
A DR and BDR in a Cisco network stands for Designated Router and Backup Designated Router. These designations are used when working with certain routing protocols such as Open-Shortest Path First (OSPF)
What are the three router roles in an OSPF network?
Designated router, the backup designated router, and the DROTHER Internetworking with Cisco and Microsoft Technologies pg. 306-307
