Questions, Answers, Braindumps (642-801)
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Which IOS features can be used to prevent routing loops
between two autonomous systems
caused by running different routing protocols and having
redundant paths between systems?
A. Route filtering
B. Passive interfaces
C. Static redistribution
D. Two-way redistribution
Two way redistribution If you must allow two-way
redistribution, enable a mechanism to reduce
the chances of routing loops. Examples of mechanisms
covered in this chapter are default routes,
route filters, and modification of the metrics
advertised. With these types of mechanisms, you can
reduce the chances of routes imported from one
autonomous system being injected into the
same autonomous system as new route information if more
one boundary router is performing
Building Scalable Cisco Networks (Ciscopress) page 471
Which of the following AS numbers is an example of a
private AS number?
This autonomous system designator is a 16-bit number,
with a range of 1 to 65535. RFC 1930
provides guidelines for the use of AS numbers. A range
of AS number, 64512 through 65535, is
reserved for private use, much like the private Internet
Protocol (IP) addresses.
Building Scalable Cisco Networks (Ciscopress) page 312
Which command would display OSPF parameters such as
filters, default metric, maximum paths,
and number of areas configured on a router?
A. show ip protocol
B. show ip route
C. show ip ospf interface
D. show ip ospf
E. show ip interface
F. None of the above
The "show ip protocol" command displays values about
routing timers and network information
associated with the entire router. This includes, the AS
number associated with the routing
process, number of areas configured on the router, the
metric, and the maximum paths.
Router ES1 has a 256kbps serial interface link to
another Company location. The configuration
file of this interface is shown below:
interface serial 0/0
ip bandwidth-percent eigrp 1 200
From the command output above, how many kbps of
bandwidth is allocated for EIGRP traffic?
A. 56 kbps
B. 112 kbps
C. 128 kbps
D. 256 kbps
The bandwidth-percent command tells EIGRP what
percentage of the configured bandwidth it
may use. The default is 50 percent. Since the bandwidth
command is also used to set the routing
protocol metric, it may be set to a particular value for
policy reasons. In this case, it is set to 56
kbps even though the actual link is 256 kbps.
The bandwidth-percent command can have values greater
than 100 if the bandwidth is
configured artificially low due to such policy reasons.
In this specific case, the bandwidth
configured on the interface is 56kbps, so 200 percent of
this value is 112 kbps.
Cisco routers perform route summarization automatically
for which three routing protocols?
E. RIP v.2
Answer: B, D, E
Sending route summaries - Routing information advertised
out an interface is automatically
summarized at major (classful) network address
boundaries by RIP, IGRP, and EIGRP.
Specifically, this autonomous summarization occurs for
those routes whose classful network
address differs from the major network address of the
interface to which the advertisement is
Building Scalable Cisco Networks (Ciscopress) page 79
While troubleshooting a BGP problem on the Company
network you notice that the 10.10.10.0/24
prefix is not being injected into the local BGP table of
ES1. The relevant configuration of router
ES1 is shown below:
router bgp 65001
neighbor 172.16.1.1 remote-as 65002
Routing table information:
show ip route | include 10
10.10.10.0/24 [110/11] via 192.168.1.1, 2d00h,
Why doesn't the local BGP table have the prefix?
A. This route is not a BGP learned route.
B. The network command is wrong.
C. The 172.16.1.1 neighbor is down.
D. The prefix 10.10.10.0/24 is not a connected route.
The correct syntax should be "network 10.10.10.0 mask
255.255.255.0" under the BGP routing
process. Without the correct subnet mask specified, the
route will not get injected into the BGP
routing table, even if it is learned via an IGP. In this
case, the route is known via OSPF.
Which command displays RIP routing transactions?
A. show ip rip database
B. show ip route
C. show ip protocols rip
D. debug ip rip
E. debug ip routing
debug ip rip
Use the debug ip rip EXEC command to display information
on RIP routing transactions. The no
form of this command disables debugging output.
What is the OSPF router ID for Company2 assuming the
router-id command is not used?
The highest ip address on an active interface is
normally used as the OSPF router ID. This can
be overridden by configuring an IP address on a loopback
address on a loopback interface.
Building Scalable Cisco Networks (Ciscopress) page 126