CCNA v3.0 Semester 3 Chapter 2 Study Guide

2.1 Link State Routing Protocol
2.1.1 / What do link-state routing algorithms maintain?
2.1.1 / What information does a distance vector algorithm have about distant networks/routers?
2.1.1 / What triggers updates when link state protocols are used?
2.1.1 / What are hardware implications of using a link state routing protocol?
2.1.1 / What is the impact on network traffic when link state routing is used?
2.1.2 / Why is it less likely that incorrect information will be propagated in a network using link state routing?
2.1.2 / What is the name given to the periodic updates used by link state routing protocols?
2.1.2 / How does a link state protocol determine the reachability of its neighbours?
2.1.2 / How do routers keep track of other routers?
2.1.2 / What are the 3 key features of link state protocols
2.1.3 / What happens when a router becomes unavailable?
2.1.3 / Why do these updates need to be sent to every router?
2.1.3 / What is another way of describing a ‘link’
2.1.3 / What information is known about a link?
2.1.3 / What is another name for the link state database?
2.1.3 / Which router is the root of the topological database?
2.1.4 / Why does LSA exchange speed up the convergence of the network?
2.1.4 / What knowledge do link state routing protocols have of the network?
2.1.4 / Why is LSA exchange more effective than distance vector routing updates?
2.1.5 / Why is it important to keep the link state database small?
2.2 Single Area OSPF Concepts
2.2.1 / What is RFC 2328?
2.2.1 / Why Is OSPF preferred to RIP v1 and v2?
2.2.1 / How are large OSPF networks designed
2.2.1 / What is the advantage of a hierarchical design?
2.2.2 / Which router port does NOT flood information onto the network?
2.2.2 / What do routers in the same OSPF area have in common?
2.2.2 / What do OSPF routers to with the information in the link state database?
2.2.2 / What is the adjacency database?
2.2.2 / What are the DR and BDR? What is their purpose?
2.2.3 / What types of networks are suited to OSPF?
2.2.3 / Why are OSPF routing updates more efficient?
2.2.4 / What is the purpose of the SPF algorithm?
2.2.5 / What type of networks are recognised by OSPF?
2.2.5 / What problem is solved by a Designated Router?
2.2.5 / What is the address is used by the DR to send link state information?
2.2.5 / What is the disadvantage of a DR. How is this problem solved?
2.2.5 / What address is used by the BDR to send link state information?
2.2.5 / Why are DR and BDR unnecessary on point to point networks?
2.2.6 / What happens when a router starts the OSFP routing process?
2.2.7 / What is the address of a hello packet
2.2.6 / What is the purpose of hello packets?
2.2.6 / How often are hello packets sent?
2.2.6 / What happens when hello packets are sent on multi access networks?
2.2.7 / What are the steps in link state operation?
2.3 Single Area OSPF Concepts
2.3.1 / What numbers can be assigned to OSPF areas?
2.3.1 / What is area 0?
2.3.1 / What is another name for Area 0?
2.3.1 / What is used instead of a subnet mask when configuring area information?
2.3.1 / What is the command to enable OSPF routing?
2.3.1 / What is the process ID?
2.3.1 / Router(config)# router ospf 1
Router(config-router)#network 192.168.9.0 0.0.0.255 area 2
Explain in as much detail as possible what the IOS commands above describe.
2.3.2 / What is the router ID used by an OSPF router?
2.3.2 / Why is a loopback interface designated on OSPF routers?
2.3.2 / What is the command used to create and assign an IP address to a loopback interface?
2.3.2 / What is the subnet mask of a loopback interface
2.3.2 / What is the OSPF priority? Explain is purpose in electing a DR/BDR
2.3.2 / What is OSPF priority 0?
2.3.2 / What happens with routers have the same priority?
2.3.2 / What is the command to configure OSPF priority?
What command is used to display OSPF priority information?
2.3.3 / What is the default bandwidth for Cisco serial interfaces
2.3.3. / How is OSFP cost calculated?
2.3.3 / Why might it be important to change OSPF cost in a gigabit Ethernet environment.
2.3.3 / Which IOS command allows you to set the link cost?
2.3.4 / What is the length of an OSPF password?
2.3.4 / Which command configures OSPF authentication / Router(config-if)#ip ospf authentication-key password
Router(config-router)area area-number authentication
2.3.4 / What is the disadvantage of this simple OSPF authentication? / The password is sent in plain text
2.3.4 / Which command configures OSPF key encryption on an interfacer?
2.3.4 / How long is the encrypted key?
2.3.4 / What values can be used by the key-id
2.3.4 / What must routers in the same area have in common when OSPF authentication is used?
2.3.4 / Which command is used to encrypt the key using MD5 authentication?
2.3.5 / What is an OSPF dead value
2.3.5 / What is the default hello interval?
2.3.5 / Why might a network administrator change the hello interval?
2.3.5 / What is an important consideration when configuring timer intervals?
2.3.5 / Which command configures the hello interval?
2.3.6 / Why is a default route used in OSPF networks?
2.3.6 / Which command configures a default route
2.3.6 / What command is used to propagate this default route to all routers in the OSPF area?
2.3.7 / Why might neighbour relationships not be formed successfully between routers?