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?
Router(config)# router ospf 1
2.3.1
Router(config-router)#network
192.168.9.0 0.0.0.255 area 2
2.3.2
2.3.2
2.3.2
2.3.2
2.3.2
2.3.2
2.3.2
2.3.2
2.3.3
2.3.3.
2.3.3
2.3.3
2.3.4
2.3.4
2.3.4
2.3.4
Explain in as much detail as possible
what the IOS commands above
describe.
What is the router ID used by an
OSPF router?
Why is a loopback interface
designated on OSPF routers?
What is the command used to create
and assign an IP address to a
loopback interface?
What is the subnet mask of a
loopback interface
What is the OSPF priority? Explain is
purpose in electing a DR/BDR
What is OSPF priority 0?
What happens with routers have the
same priority?
What is the command to configure
OSPF priority?
What command is used to display
OSPF priority information?
What is the default bandwidth for
Cisco serial interfaces
How is OSFP cost calculated?
Why might it be important to change
OSPF cost in a gigabit Ethernet
environment.
Which IOS command allows you to
set the link cost?
What is the length of an OSPF
password?
Which command configures OSPF
authentication
What is the disadvantage of this
simple OSPF authentication?
Which command configures OSPF key
encryption on an interfacer?
Router(config-if)#ip ospf
authentication-key password
Router(config-router)area area-number
authentication
The password is sent in plain text
2.3.4
2.3.4
2.3.4
2.3.4
2.3.5
2.3.5
2.3.5
2.3.5
2.3.5
2.3.6
2.3.6
2.3.6
2.3.7
How long is the encrypted key?
What values can be used by the keyid
What must routers in the same area
have in common when OSPF
authentication is used?
Which command is used to encrypt
the key using MD5 authentication?
What is an OSPF dead value
What is the default hello interval?
Why might a network administrator
change the hello interval?
What is an important consideration
when configuring timer intervals?
Which command configures the hello
interval?
Why is a default route used in OSPF
networks?
Which command configures a default
route
What command is used to propagate
this default route to all routers in the
OSPF area?
Why might neighbour relationships
not be formed successfully between
routers?