Cisco 300-410 Online Practice Questions and Exam Preparation

Cisco 300-410 Online Questions & Answers

• Question 841:

  Which of the following statements is NOT true about BGP peers?

  A. eBGP peers use TCP to communicate
  B. eBGP peers use port 179 by default
  C. eBGP peers do not update the AS_Path attribute before sending updates to another eBGP peer
  D. iBGP peers do not update the AS_Path attribute before sending updates to an iBGP peer
  C. eBGP peers do not update the AS_Path attribute before sending updates to another eBGP peer

  ---

  External BGP (eBGP) peers do update the AS_Path attribute before sending updates to another eBGP peer. This helps to maintain the path back to the source of the update.

  eBGP peers use TCP to communicate, and they do so on port 179 by default.

  Internal BGP (BGP) peers are routers that reside in the same AS. iBGP peers do not update the AS_Path attribute before sending updates to an iBGP peer. That is only done when an update is sent from an eBGP peer to another eBGP peer.

  Objective:

  Layer 3 Technologies

  Sub-Objective:

  Explain BGP attributes and best-path selection

  References:

  Home > About Cisco > Publications and Merchandise > The Internet Protocol Journal > Back issues > Volume 9,Number 1, March 2006 > Autonomous System Numbers > Exploring Autonomous System Numbers

• Question 842:

  An engineer configured a Cisco router to send reliable and encrypted notifications for any events to the management server. It was noticed that the notification messages are reliable but not encrypted. Which action resolves the issue?

  A. Configure all devices for SNMPv3 informs with auth.
  B. Configure all devices for SNMPv3 informs with priv.
  C. Configure all devices for SNMPv3 traps with auth.
  D. Configure all devices for SNMPv3 traps with priv.
  B. Configure all devices for SNMPv3 informs with priv.

  ---

  SNMP notifications can be sent as traps or inform requests. Traps are unreliable because the receiver does not send acknowledgments when this device receives traps."Send reliable and encrypted notifications for any events" so it is SNMP notifications. For encryption we need to configure "priv".

• Question 843:

  Refer to the exhibit. Branch 2 hosts cannot receive dynamic IP addresses. Which action resolves the issue?

  

  A. Configure the ip helper command on the Layer 2 switch SW2 interfaces.
  B. Configure the ip helper command on the Interface GigabltEthernet 0/0 of the DHCP router.
  C. Configure the ip helper command on the Interface GigabltEthernet 0/2 of the DHCP router.
  D. Configure the ip helper command on the interface GigabltEthernet 0/2 of the R2 router.
  D. Configure the ip helper command on the interface GigabltEthernet 0/2 of the R2 router.

• Question 844:

  What are the two prerequisites to enable BFD on Cisco routers? (Choose two)

  A. A supported IP routing protocol must be configured on the participating routers.
  B. OSPF Demand Circuit must run BFD on all participating routers.
  C. ICMP must be allowed on all participating routers.
  D. UDP port 1985 must be allowed on all participating routers.
  E. Cisco Express Forwarding and IP Routing must be enabled on all participating routers.
  C. ICMP must be allowed on all participating routers.
  E. Cisco Express Forwarding and IP Routing must be enabled on all participating routers.

• Question 845:

  Refer to the exhibit.

  

  An engineer must establish multipoint GRE tunnels between hub router R6 and branch routers R1, R2, and R3. Which configuration accomplishes this task on R1?

  A. interface Tunnel 1 ip address 192.168.1.1 255.255.255.0 tunnel source e0/1 tunnel mode gre multipoint ip nhrp network-id 1 ip nhrp nhs 192.168.1.6 ip nhrp map 192.168.1.6 192.1.10.1 ip nhrp map 192.168.1.2 192.1.20.2 ip nhrp map 192.168.1.3 192.1.30.3
  B. interface Tunnel 1 ip address 192.168.1.1 255.255.255.0 tunnel source e0/0 tunnel mode gre multipoint ip nhrp nhs 192.168.1.6 ip nhrp map 192.168.1.6 192.1.10.1 ip nhrp map 192.168.1.2 192.1.20.2 ip nhrp map 192.168.1.3 192.1.30.3
  C. interface Tunnel 1 ip address 192.168.1.1 255.255.255.0 tunnel source e0/1 tunnel mode gre multipoint ip nhrp nhs 192.168.1.6 ip nhrp map 192.168.1.6 192.1.10.6
  D. interface Tunnel 1 ip address 192.168.1.1 255.255.255.0 tunnel source e0/0 tunnel mode gre multipoint ip nhrp network-id 1 ip nhrp nhs 192.168.1.6 ip nhrp map 192.168.1.6 192.1.10.6
  D. interface Tunnel 1 ip address 192.168.1.1 255.255.255.0 tunnel source e0/0 tunnel mode gre multipoint ip nhrp network-id 1 ip nhrp nhs 192.168.1.6 ip nhrp map 192.168.1.6 192.1.10.6

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  We have an example of how to configure DMVPN Phase II and we show the configuration here for your reference:

  

  Diagram DMVPN Phase II - Dynamic Mapping

  

  Text

  Note: Although Phase II Dynamic Mapping is "dynamic" but we still need to add a static entry for the hub because without that entry, the NHRP registration cannot be sent.

• Question 846:

  Refer to the exhibit.

  

  All interfaces on each router are participating in the EIGRP 100 process. Interface Loopback 2 on HQR2 is currently in shutdown mode. An engineer issues the eigrp stub command on router BR1. Which statements about the query messages sent from router HQ-R2 for a route to reach the 12.12.12.12/32 network is true?

  A. Router HQ-R2 sends a query message to the feasible successor for a route to 12.12.12.12/32 network.
  B. BR1 receives query messages from HQ-R2 for a route to 12.12.12.12/32 network
  C. Router HQ-R1 receives query messages from HQ-R2 for a route to 12.12.12.12/32 network.
  D. Router HQ-R1 and BR1 receives query messages from HQ-R2 for a route to 12.12.12/32 network.
  C. Router HQ-R1 receives query messages from HQ-R2 for a route to 12.12.12.12/32 network.

• Question 847:

  Refer to the exhibit. Routers R1 and R2 exchange routes to each other's loopback through OSPF. Telnet traffic must be blocked from R2 Lo0 to R1 Lo2. Which configuration resolves the issue?

  

  

  

  

  A. Option A
  B. Option B
  C. Option C
  D. Option D
  C. Option C

• Question 848:

  Your network has an OSPF area that connects to an EIGRP area at two points, Router A and Router B. You directed your assistant to set up these two routers in order to have traffic load-balanced between the two entry points. However, you discover that all traffic is going through Router A. When you view the results of the show run command for each device, you get the partial output shown below:

  

  What action should be performed to make traffic use both routes to the EIGRP area?

  A. change the metric for EIGRP to 50 on Router A
  B. change the metric for EIGRP to 45 on Router B
  C. change the metric type to Type 1 on Router A
  D. change the metric type to Type 1 on Router B
  A. change the metric for EIGRP to 50 on Router A

  ---

  You should change the metric for EIGRP to 50 on Router A. The metric can be defined when configuring the redistribution of one routing protocol into another. A lower metric will cause traffic to be routed in that direction. Therefore, to make the paths from the two routers equal, you should raise the metric on Router A to 50 to match that of Router B.

  You should not lower the metric on Router B to 45. It will still be a higher metric than that of A and traffic will still go in that direction.

  You should not change the metric type on either router. The metric type determines whether the downstream OSPF routers should add their cost to the total cost to get to the ASBR when computing cost. In this scenario, Router A and Router B are both ASBRs. When set to Type 1, downstream OSPF routers do add their metric. With Type 2, they simply use the configured metric. If you want true load balancing, you should leave the metric type set to Type 2, since you have no information on the cost from the

  other routers to the ASBRs. However, when Type 1 is used, you must also take into consideration the metric from the other routers to the ASBR when determining the true cost to leave the OSPF area.

  Objective:

  Layer 3 Technologies

  Sub-Objective:

  Configure and verify redistribution between any routing protocols or routing sources

  References:

  Home > Support > Technology Support > IP > IP Routing > Design > Design Technotes > Redistributing Routing Protocols

  Cisco > Support > Technology Support > IP > IP Routing > Design > Design Technotes > Route Selection in Cisco Routers > Document ID: 8651

• Question 849:

  Refer to the exhibit.

  

  An engineer recently implemented uRPF by configuring the ip verify unicast source reachable-via rx command on interface gi0/3. The engineer noticed right after implementing uRPF that an inbound packet on the gi0/3 interface with a source address of 172.16.3.251 was dropped. Which action resolves the issue?

  A. Configure uRPF loose mode to forward the packet.
  B. Permit the 172.16.3.251 in the inbound ACL on interface gi0/3.
  C. Remove inbound ACL from the interface gi0/3 to allow 172.16.3.251.
  D. Configure uRPF strict mode to forward the packet.
  A. Configure uRPF loose mode to forward the packet.

• Question 850:

  View the sample output of the debug ip eigrp command.

  

  What is the significance of the number 4294967295 as shown in the output?

  A. It represents the unreachable metric for EIGRP.
  B. It represents the administrative distance for EIGRP.
  C. It represents a reachable metric for the given network.
  D. It represents one of the link characteristics that EIGRP uses to calculate the metric.
  A. It represents the unreachable metric for EIGRP.

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  The value 4294967295 in the debug ip eigrp output represents the unreachable metric for EIGRP. This means that the network has become unavailable and cannot be reached. In this output, the M represents the local metric, and the SM represents the metric that was reported by the neighbor that advertised the network to the local router.

  The administrative distance (AD) for internal EIGRP is 90.

  The link characteristics that are used in the EIGRP calculation are shown following the dash after the M and SM values (1657856 4294967295). By default, EIGRP only uses bandwidth and delay in its calculation.

  Objective:

  Layer 3 Technologies

  Sub-Objective:

  Describe and optimize EIGRP metrics

  References:

  Cisco > Cisco IOS Debug Command Reference > debug h225 asn1 through debug ip ftp > debug ip eigrp