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NO.1 Which parameter or parameters are used to calculate OSPF cost in Cisco routers?
A. Bandwidth, Delay, and MTU
B. Bandwidth, MTU, Reliability, Delay, and Load
C. Bandwidth and Delay
D. Bandwidth
Answer: D
200-105 exam prep
Explanation:
http://www.cisco.com/en/US/tech/tk365/technologies_white_paper09186a0080094e9e.sht ml#t6
OSPF Cost
The cost (also called metric) of an interface in OSPF is an indication of the overhead required to send
packets across a certain interface. The cost of an interface is inversely proportional to the bandwidth
of that interface. A higher bandwidth indicates a lower cost.
There is more overhead (higher cost) and time delays involved in crossing a 56k serial line than
crossing a 10M Ethernet line. The formula used to calculate the cost is: Cost= 10000 0000/bandwidth
in bps
For example, it will cost 10 EXP8/10 EXP7 = 10 to cross a 10M Ethernet line and will cost 10
EXP8/1544000 =64 to cross a T1 line. By default, the cost of an interface is calculated based on the
bandwidth; you can force the cost of an interface with the ip ospf cost <value> interface sub
configuration mode command.
NO.2 Refer to the exhibit.
Assume that all router interfaces are operational and correctly configured. In addition, assume that
OSPF has been correctly configured on router R2. How will the default route configured on R1 affect
the operation of R2?
A. Any packet destined for a network that is not directly connected to router R2 will be dropped
immediately because of the lack of a gateway on R1.
B. Any packet destined for a network that is not referenced in the routing table of router R2 will be
directed to R1. R1 will then send that packet back to R2 and a routing loop will occur.
C. The networks directly connected to router R2 will not be able to communicate with the
172.16.100.0, 172.16.100.128, and 172.16.100.64 subnetworks.
D. Any packet destined for a network that is not directly connected to router R1 will be dropped.
E. Any packet destined for a network that is not directly connected to router R2 will be dropped
immediately.
Answer: B
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Explanation:
First, notice that the more-specific routes will always be favored over less-specific routes regardless
of the administrative distance set for a protocol. In this case, because we use OSPF for three
networks (172.16.100.0 0.0.0.3, 172.16.100.64 0.0.0.63, 172.16.100.128 0.0.0.31) so the packets
destined for these networks will not be affected by the default route. The default route configured
on R1 "ip route 0.0.0.0 0.0.0.0 serial0/0 will send any packet whose destination network is not
referenced in the routing table of router R1 to R2, it doesn't drop anything so answers A, B and C are
not correct. D is not correct too because these routes are declared in R1 and the question says that
"OSPF has been correctly configured on router R2, so network directly connected to router R2 can
communicate with those three subnetworks. As said above, the default route configured on R1 will
send any packet destined for a network that is not referenced in its routing table to
R2; R2 in turn sends it to R1 because it is the only way and a routing loop will occur.