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2021 Apr 400-101 study guide
Q201. Refer to the exhibit.
Which additional configuration is necessary for R1 and R2 to become OSPF neighbors?
A. R1
!
router ospf 1
no passive-interface Fastethernet0/0
!
B. R2
!
router ospf 10
no network 10.1.1.6 0.0.0.0 area 0
network 10.1.1.6 0.0.0.0 area 1
!
C. R1
!
interface FastEthernet0/0
ip ospf mtu-ignore
!
R2
!
interface FastEthernet0/1
ip ospf mtu-ignore !
D. R1
!
no router ospf 1
router ospf 10
network 10.1.1.5 0.0.0.0 area 0
Answer: A
Explanation:
Because the passive interface default command is used, by default all interfaces are passive and no neighbors will form on these interfaces. We need to disable passive interface on the link to R2 by using the “no passive-interface Fastethernet0/0” on R1 under OSPF.
Q202. What is the maximum number of classes that MQC can support in a single policy map?
A. 512
B. 256
C. 128
D. 64
Answer: B
Q203. DRAG DROP
Drag each show command on the left to the description of its output on a PE router on the right.
Answer:
Q204. Refer to the exhibit.
Which OSPFv3 routes will be visible in the routing table of R2?
A. 2001:12::1/128
B. 2001:12::1/128, 2001:112::1/128
C. 2001:12::2/128
D. No OSPFv3 routes will be visible.
Answer: D
Explanation:
The command “ipv6 unicast-routing” needs to be configured on both routers before any IPv6 routes will be seen.
Q205. DRAG DROP
Drag and drop the BGP attribute on the left to the correct category on the right.
Answer:
Most recent 400-101 free exam questions:
Q206. Refer to the exhibit.
What is the role of this multicast router?
A. a first-hop PIM router
B. a last-hop PIM router
C. a PIM rendezvous point
D. a PIM inter-AS router
Answer: C
Explanation:
The following is sample output from the show ip pim tunnel taken from an RP. The output is used to verify the PIM Encap and Decap Tunnel on the RP:
Switch# show ip pim tunnel
Tunnel0
Type : PIM Encap
RP : 70.70.70.1*
SourcE. 70.70.70.1
Tunnel1*
Type : PIM Decap
RP : 70.70.70.1*
SourcE. -R2#
The asterisk (*) indicates that the router is the RP. The RP will always have a PIM Encap and Decap Tunnel interface.
Reference:
http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3650/software/release/3se/multic ast/command_reference/b_mc_3se_3650_cr/b_mc_3se_3650_cr_chapter_010.html#wp12 86920037
Q207. Refer to the exhibit.
All of the routers on this network are running RIP. If you edit the R3 RIP process configuration to reduce the number of hops from R3 to R1, which statement about the configuration change is true?
A. Configuring no passive-interface for GigabitEthernet0/0 in the R3 RIP process reduces the number of hops to R1 by 2.
B. Configuring no passive-interface for GigabitEthernet0/0 in the R3 RIP process reduces the number of hops to R1 by 1.
C. Configuring no passive-interface for GigabitEthernet0/1 in the R3 RIP process reduces the number of hops to R1 by 3.
D. Configuring no passive-interface for GigabitEthernet0/1 in the R3 RIP process reduces the number of hops to R1 by 1.
Answer: A
Explanation:
By changing the link from R3 to R2 to not be passive, traffic can then take the direct route from R3-R2-R1 instead of the longer path of R3-R6-R5-R4-R1, resulting in two less hops.
Q208. Refer to the exhibit.
Which statement about the debug behavior of the device is true?
A. The device debugs all IP events for 172.16.129.4.
B. The device sends all debugging information for 172.16.129.4.
C. The device sends only NTP debugging information to 172.16.129.4.
D. The device sends debugging information every five seconds.
Answer: A
Explanation:
This is an example of a conditional debug, where there is a single condition specified of IP address 172.16.129.4. So, all IP events for that address will be output in the debug.
Q209. Refer to the exhibit.
Which BGP feature allows R1 to send R2 a list of prefixes that R2 is prevented from advertising to R1?
A. route refresh
B. Prefix-Based Outbound Route Filtering
C. distribute lists
D. prefix lists
Answer: B
Q210. Refer to the exhibit.
Which two are causes of output queue drops on FastEthernet0/0? (Choose two.)
A. an oversubscribed input service policy on FastEthernet0/0
B. a duplex mismatch on FastEthernet0/0
C. a bad cable connected to FastEthernet0/0
D. an oversubscribed output service policy on FastEthernet0/0
E. The router trying to send more than 100 Mb/s out of FastEthernet0/0
Answer: D,E
Explanation:
Output drops are caused by a congested interface. For example, the traffic rate on the outgoing interface cannot accept all packets that should be sent out, or a service policy is applied that is oversubscribed. The ultimate solution to resolve the problem is to increase the line speed. However, there are ways to prevent, decrease, or control output drops when you do not want to increase the line speed. You can prevent output drops only if output drops are a consequence of short bursts of data. If output drops are caused by a constant high-rate flow, you cannot prevent the drops. However, you can control them.
Reference: http://www.cisco.com/c/en/us/support/docs/routers/10000-series-routers/6343-queue-drops.html
