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Q161. Refer to the exhibit.
Routers R1, R2, and R3 are configured as shown, and traffic from R2 fails to reach 172.29.168.3.
Which action can you take to correct the problem?
A. Correct the static route on R1.
B. Correct the default route on R2.
C. Edit the EIGRP configuration of R3 to enable auto-summary.
D. Correct the network statement for 172.29.168.3 on R3.
Answer: A
Explanation:
On R1 we see there is a wrongly configured static route: ip route 172.29.168.3 255.255.255.255 172.17.17.2. It should be ip route 172.29.168.3 255.255.255.255 10.17.12.3.
Q162. In a network where a Layer 2 switch interconnects several routers, which feature restricts multicast packets for each IP multicast group to only those mulicast router ports that have downstream receivers joined to that group?
A. PIM snooping
B. IGMP snooping
C. IGMP filter
D. IGMP proxy
Answer: A
Explanation:
In networks where a Layer 2 switch interconnects several routers, such as an Internet exchange point (IXP), the switch floods IP multicast packets on all multicast router ports by default, even if there are no multicast receivers downstream. With PIM snooping enabled, the switch restricts multicast packets for each IP multicast group to only those multicast router ports that have downstream receivers joined to that group. When you enable PIM snooping, the switch learns which multicast router ports need to receive the multicast traffic within a specific VLAN by listening to the PIM hello messages, PIM join and prune messages, and bidirectional PIM designated forwarder-election messages.
Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SX/configuration/guide/book/snooppim.html
Q163. Refer to the exhibit.
Which two statements are true regarding prefix 10.1.0.0/24? (Choose two.)
A. The prefix is in policy, and Cisco PfR rerouted the traffic via 10.4.5.3 Et0/1 because of an OOP event.
B. Cisco PfR is monitoring the prefix via passive NetFlow mode only.
C. Cisco PfR is monitoring the prefix via active, fast, or active throughput IP SLA probe mode only.
D. The prefix is in policy, and Cisco PfR did not reroute the traffic via 10.4.5.3 Et0/1 because the traffic was previously in policy.
E. Cisco PfR is monitoring the prefix via mode monitor, which provides both NetFlow and IP SLA measurements.
Answer: D,E
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/pfr/command/pfr-cr-book/pfr-s1.html#wp2707728086
Q164. Refer to the exhibit.
When the link between RtrB and RtrC goes down, multicast receivers stop receiving traffic from the source for multicast group 229.1.1.1.Which solution will resolve this?
A. adding a static mroute on RtrB and RtrF
B. adding a static unicast route on RtrB and RtrF
C. creating a GRE tunnel between RtrB and RtrD
D. enabling PIM sparse mode on both ends of the link between RtrB and RtrF
Answer: D
Explanation:
For multicast traffic to flow, PIM must be enabled on all routers in the path of the multicast stream.
Q165. Which two statements about HSRP are true? (Choose two.)
A. Its virtual MAC is 0000.0C07.Acxx.
B. Its multicast virtual MAC is 0000.5E00.01xx.
C. Its default configuration allows for pre-emption.
D. It supports tracking.
E. It supports unique virtual MAC addresses.
Answer: A,D
Explanation:
Default HSRP Configuration
Feature
Default Setting
HSRP version
Version 1
HSRP groups
None configured
Standby group number
0
Standby MAC address
System assigned as: 0000.0c07.acXX, where XX is the HSRP group number
Standby priority
100
Standby delay
0 (no delay)
Standby track interface priority
10
Standby hello time
3 seconds
Standby holdtime
10 seconds
. The standby track interface configuration command ties the router hot standby priority to the availability of its interfaces and is useful for tracking interfaces that are not configured for HSRP. When a tracked interface fails, the hot standby priority on the device on which tracking has been configured decreases by 10. If an interface is not tracked, its state changes do not affect the hot standby priority of the configured device. For each interface configured for hot standby, you can configure a separate list of interfaces to be tracked.
. The standby track interface-priority interface configuration command specifies how much to decrement the hot standby priority when a tracked interface goes down. When the interface comes back up, the priority is incremented by the same amount.
Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/1 2-2_55_se/configuration/guide/3750xscg/swhsrp.html
Up to date 400-101 free question:
Q166. Refer to the exhibit.
All routers are running EIGRP and the network has converged. R3 and R4 are configured as EIGRP Stub. If the link between R1 and R3 goes down, which statement is true?
A. R1 sends traffic destined to 192.168.0.100 via R2.
B. R2 does not have a route to 192.168.0.0/24 in the routing table.
C. The prefix 192.168.0.0/24 becomes stuck-in-active on R4.
D. R3 does not advertise 192.168.0.0/24 to R4 anymore.
Answer: B
Q167. What is the function of an EIGRP sequence TLV packet?
A. to acknowledge a set of sequence numbers during the startup update process
B. to list the peers that should listen to the next multicast packet during the reliable multicast process
C. to list the peers that should not listen to the next multicast packet during the reliable multicast process
D. to define the initial sequence number when bringing up a new peer
Answer: C
Explanation:
EIGRP sends updates and other information between routers using multicast packets to 224.0.0.10. For example in the topology below, R1 made a change in the topology and it needs to send updates to R2 & R3. It sends multicast packets to EIGRP multicast address 224.0.0.10. Both R2 & R3 can receive the updates and acknowledge back to R1 using unicast. Simple, right? But what if R1 sends out updates, only R2 replies but R3 never does? In the case a router sends out a multicast packet that must be reliable delivered (like in this case), an EIGRP process will wait until the RTO (retransmission timeout) period has passed before beginning a recovery action. This period is calculated from the SRTT (smooth round-trip time). After R1 sends out updates it will wait for this period to expire. Then it makes a list of all the neighbors from which it did not receive an Acknowledgement (ACK). Next it sends out a packet telling these routers stop listening to multicast until they are been notified that it is safe again. Finally the router will begin sending unicast packets with the information to the routers that didn’t answer, continuing until they are caught up. In our example the process will be like this:
1. R1 sends out updates to 224.0.0.10
2. R2 responds but R3 does not
3. R1 waits for the RTO period to expire
4. R1 then sends out an unreliable-multicast packet, called a sequence TLV (Type-Length-Value) packet, which tells R3 not to listen to multicast packets any more
5. R1 continues sending any other muticast traffic it has and delivering all traffic, using unicast to R3, until it acknowledges all the packets
6. Once R3 has caught up, R1 will send another sequence TLV, telling R3 to begin listening to multicast again. The sequence TLV packet contains a list of the nodes that should not listen to multicast packets while the recovery takes place. But notice that the TLV packet in step 6 does not contain any nodes in the list.
Note. In the case R3 still does not reply in step 4, R1 will attempt to retransmit the unicast 16 times or continue to retransmit until the hold time for the neighbor in question expires. After this time, R1 will declare a retransmission limit exceeded error and will reset the neighbor.
(Reference: EIGRP for IP: Basic Operation and Configuration)
Q168. Which statement is true about trunking?
A. Cisco switches that run PVST+ do not transmit BPDUs on nonnative VLANs when using a dot1q trunk.
B. When removing VLAN 1 from a trunk, management traffic such as CDP is no longer passed in that VLAN.
C. DTP only supports autonegotiation on 802.1q and does not support autonegotiation for ISL.
D. DTP is a point-to-point protocol.
Answer: D
Explanation:
Ethernet trunk interfaces support different trunking modes. You can set an interface as trunking or nontrunking or to negotiate trunking with the neighboring interface. To autonegotiate trunking, the interfaces must be in the same VTP domain. Trunk negotiation is managed by the Dynamic Trunking Protocol (DTP), which is a Point-to-Point Protocol. However, some internetworking devices might forward DTP frames improperly, which could cause misconfigurations.
Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750/software/release/12-2_55_se/configuration/guide/scg3750/swvlan.html
Q169. Which statement about SSHv2 is true?
A. Routers acting as SSH clients can operate without RSA keys.
B. SSHv2 supports port forwarding and compression.
C. The RSA key pair size must be at least 512.
D. You must configure a default gateway before you enable SSHv2.
Answer: A
Q170. Which two statements are true about OTV? (Choose two.)
A. It relies on flooding to propagate MAC address reachability information.
B. It uses a full mesh of point-to-multipoint tunnels to prevent head-end replication of multicast traffic.
C. It can work over any transport that can forward IP packets.
D. It supports automatic detection of multihoming.
Answer: C,D
Explanation:
The overlay nature of OTV allows it to work over any transport as long as this transport can forward IP packets. Any optimizations performed for IP in the transport will benefit the OTV encapsulated traffic. As part of the OTV control protocol, automatic detection of multihoming is included. This feature enables the multihoming of sites without requiring additional configuration or protocols
Reference: http://www.cisco.com/c/en/us/products/collateral/switches/nexus-7000-series-switches/white_paper_c11-574984.html