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Test4pass Cisco 642-902 braindumps
Exam Number/Code: 642-902
Exam Name: implementing cisco ip routing
Questions and Answers : 148 Q&As
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Test4pass Cisco CCNP 642-902 exam braindumps questions and answers
1. A router has been configured with the commands router eigrp 9 and network 172.16.1.0 0.0.0.255. No
other EIGRP-related commands have been configureD. The answers list the IP addresses that could be
assigned to this router’s Fa0/0 interfacE. Which answers list an IP address/prefix length that would cause
the router to enable EIGRP on Fa0/0?
A. 172.16.0.1/23
B. 172.16.1.1/26
C. 172.16.1.1/24
D. 172.16.0.255/23
E. None of the other answers is correct.
Answer: BC
Explanation: The network 172.16.1.0 0.0.0.255 command tells IOS to match the first three octets when
comparing the interface IP addresses to the configured “172.16.1.0”valuE. Only two answers match in the
first three octets. The other two answers have a 0 in the 3rd octet, making the addresses not match the
network commanD.
2. Router R1 has working interfaces S0/0, S0/1, and S0/2, with IP address/prefix combinations of
10.10.10.1/24, 10.10.11.2/24, and 10.10.12.3/22. R1’s configuration includes the commands router eigrp 9
and network 10.0.0.0. The show ip eigrp interfaces command lists S0/0 and S0/1 in the command output,
but not S0/2. Which answer gives the reason for the omission? (Choose two answers.)
A. R1 has EIGRP neighbors reachable via S0/0 and S0/1, but not via S0/2, so it is not includeD.
B. S0/2 may currently be in a state other than up/up.
C. The network 10.0.0.0 command requires the use of mask 255.0.0.0 due to EIGRP being classful by
default.
D. S0/2 may be configured as a passive interfacE.
Answer: B
Explanation: The show ip eigrp interfaces command displays working (up/up) interfaces on which EIGRP
has been enabled but omits passive interfaces. A failure of the interface, or making the interface passive,
would omit the interface from the output of this commanD.
3. Routers R1 and R2 are EIGRP neighbors using their Fa0/0 interfaces, respectively. An engineer adds theip hello-interval eigrp 9 6 command to R1’s Fa0/0 configuration.Which of the following is true regarding the
results from this change?
A. The show ip eigrp neighbors command on R1 lists the revised Hello timer.
B. The show ip eigrp interfaces command on R1 lists the revised Hello timer.
C. The R1-R2 neighborship fails due to Hello timer mismatcH.
D. The show ip eigrp interfaces detail command on R1 lists the revised Hello timer.
Answer: D
Explanation: The show ip eigrp interfaces detail command does display a router’s EIGRP Hello timer setting
for each enabled interfacE. The other listed commands do not display the timer. Also, EIGRP routers do not
have to have matching Hello timers to become neighbors.
4. Routers R1 and R2, currently EIGRP neighbors over their Fa0/0 interfaces (respectively), both use
EIGRP authentication. Tuesday at 8 p.m. the neighborship fails. Which of the following would not be useful
when investigating whether authentication had anything to do with the failure?
A. debug eigrp packet
B. show key chain
C. show ip eigrp neighbor failure
D. show clock
Answer: C
Explanation: The show ip eigrp neighbors failure command is not a valid IOS commanD. The debug
displays messages that state when a neighborship fails due to authentication each time Hellos are
exchangeD. The show key chain command lists the specific keys that are currently valid, allowing you to
determine if both routers use the same key values in currently valid keys. The show clock command
displays the current time-of-day clock setting on a router, allowing you to check the valid times of the
various keys versus the two router’s clocks.
5. Router R1 has been configured with the commands router eigrp 9 and network 172.16.2.0 0.0.0.255,
with no other current EIGRP configuration. R1’s (working) Fa0/0 interface has been configured with IP
address 172.16.2.2/26. R1 has found three EIGRP neighbors reachable via interface Fa0/0, including the
router with IP address 172.16.2.20. When the engineer attempts to add the neighbor 172.16.2.20 fa0/0command in EIGRP configuration mode, which of the following occurs?
A. Fa0/0 fails.
B. The command is rejecteD.
C. The existing three neighbors fail.
D. The neighborship with 172.16.2.20 fails and then reestablishes.
E. None of the other answers is correct.
Answer: C
Explanation: The neighbor 172.16.2.20 fa0/0 command would only be rejected if the IP address
(172.16.2.20) is not inside the range of addresses in the subnet (172.16.2.0/26, range
172.16.2.0–172.16.2.63). This command does not impact interface statE. The command does disable all
EIGRP multicasts, and because the three dynamically discovered neighbors require the EIGRP multicasts,
all three neighbors fail. Although 172.16.2.20 is a valid potential neighbor, both routers must be configured
with static neighbor commands, and we know that 172.16.2.20 was not previously configured with a static
neighbor command; otherwise, it could not have been a neighbor with R1.
6. Which of the following settings could prevent two potential EIGRP neighbors from becoming neighbors?
(Choose two answers.)
A. The interface used by one router to connect to the other router is passive in the EIGRP process.
B. Duplicate EIGRP router IDs.
C. Mismatched Hold Timers.
D. IP addresses of 10.1.1.1/24 and 10.2.2.2/24, respectively.
Answer: AD
Explanation: Table 2-4 lists the issues. For EIGRP, Router IDs do not have to be unique for EIGRP routers
to become neighbors, and the hold timer does not have to match between the two neighbors. However,
making an interface passive disables the processing of all EIGRP messages on the interface, preventing all
neighborships. Mismatched IP subnets also prevent neighborships from forminG.

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