Cisco 300-410 Online Practice Questions and Exam Preparation

Cisco 300-410 Online Questions & Answers

• Question 281:

  You are using an aggregate static route to null 0 to redistribute static routes into BGP. Which problem can result if the router loses access to one of these routes?

  A. Black hole
  B. Routing loop
  C. Split horizon
  D. Unstable BGP table
  A. Black hole

  ---

  If one of the aggregated routes is lost, the router will discard packets destined for that route. This condition is known as a black hole.

  For example, suppose you have a number of subnets of range 11.1.0.0/16, all of which have 24 bit masks, such as 11.1.2.0/24. You aggregate them all to 11.1.0.0/16 and advertise that aggregate. If this router were to lose connectivity to one of the subnets, for example 11.1.3.0/24, then any traffic routed through this router to that subnet would never reach it, even if there were another valid path.

  Split horizon is a loop avoidance mechanism that is by default always in effect, and is not affected by the loss of a subnet route that is part of an aggregate route.

  BGP tables are not made unstable by the loss of the loss of a subnet route that is part of an aggregate route.

  Routing loops would not occur simply from the loss of a subnet route that is part of an aggregate route.

  Objective:

  Layer 3 Technologies

  Sub-Objective:

  Configure and verify manual and autosummarization with any routing protocol

  References:

  Cisco > IP Routing: BGP Configuration Guide > BGP4 > Aggregating Route Prefixes Using BGP

• Question 282:

  You have implemented an automatic 6-to-4 tunnel between the routers rtrA and rtrB as shown in the following network diagram:

  

  The routers rtrA and rtrB are connected to two IPv6 subnets and are separated by an IPv4 network. You decide to verify whether the tunnel was correctly implemented using the show running-config command.

  Which of the following commands should exist in the output of the show running-config command on rtrA and rtrB? (Choose all that apply.)

  A. interface tunnel
  B. tunnel source
  C. tunnel destination
  D. tunnel mode ipv6ip
  E. tunnel mode ipv6ip 6to4
  A. interface tunnel
  B. tunnel source
  E. tunnel mode ipv6ip 6to4

  ---

  The following commands should exist in the output of the show running-config command on rtrA and rtrB:

  interface tunnel

  tunnel source

  tunnel mode ipv6ip 6to4

  The interface tunnel command is used to define a tunnel interface on the router. The tunnel source command allows you to specify the source of the tunnel, which is the router interface that faces the IPv4 network. The tunnel source must be configured with an IPv4 address. The tunnel mode ipv6ip 6to4 command is used to specify the tunneling mechanism, which in this case is automatic 6-to-4.

  The partial output of the show running-config command on rtrA is as follows:

  !

  interface Tunnel0

  no ip address

  tunnel mode ipv6ip 6to4

  tunnel source 172.50.20.5

  ipv6 address 2002:ac32:of06::1/48

  !

  The partial output of the show running-config command on rtrB is as follows:

  !

  interface Tunnel0

  no ip address

  tunnel mode ipv6ip 6to4

  tunnel source 172.50.20.1

  ipv6 address 2002:ac32:0f06::2/48

  !

  The tunnel destination command and the tunnel mode ipv6ip commands do not appear in the show running- config output when automatic 6-to-4 tunnels are implemented on rtrA and rtrB. Both of these commands are executed for manually configured tunnels.

  Objective:

  Network Principles

  Sub-Objective:

  Recognize proposed changes to the network

  References:

  Cisco Press > Articles > Cisco Certification > CCNP > CCNP Self-Study: Advanced IP Addressing Cisco Interface and Hardware Component Configuration Guide > IPv6 Automatic 6to4 Tunnels Cisco > Support > Technology Support > IP > IP Version 6 (IPV6) > Configure > Configuration Examples and Technotes > IPv6 Tunnel Through an IPv4 Network

  Cisco IOS IPv6 Implementation Guide > Implementing Tunneling for IPv6

• Question 283:

  Refer to the exhibit.

  

  R1 has a route map configured, which results in a loss of partial IPv6 prefixes for the BGP neighbor, resulting in service degradation. How can the full service be restored?

  A. The neighbor requires a soft reconfiguration, and this will clear the policy without resetting the BGP TCP connection.
  B. The prefix lit requires all prefixes that R1 is advertising to be added to it, and this will allow additional prefixes to be advertised.
  C. The route map requires a deny 20 statement without set conditions, and this will allow additional prefixes to be advertised.
  D. The route map requires a permit 20 statement without set conditions, and this will allow additional prefixes to be advertised.
  D. The route map requires a permit 20 statement without set conditions, and this will allow additional prefixes to be advertised.

  ---

• Question 284:

  Which technique removes the outermost label of an MPLS-tagged packet before the packet is forwarded to an adjacent LER?

  A. label swap
  B. explicit-null
  C. label imposition
  D. PHP
  D. PHP

• Question 285:

  You just received the following system message.

  *Mar 1 18:46:11:553 %SYS-5-CONFIG_I: Configured from console by vty2 (10.34.195.36)

  (Switch-2)

  With this message in mind, which of the following commands were executed on the device? (Choose all that apply.)

  A. logging console level notifications
  B. logging console level 4
  C. service timestamps log datetime msec
  D. service timestamps log datetime
  A. logging console level notifications
  C. service timestamps log datetime msec

  ---

  The two commands that must have been executed to produce output in that format are logging console level notifications and service timestamps log datetime msec.

  The logging console level notifications command species that all messages at level 5 (notifications and above) will be sent to the console. This is not entered by the number of the message type, but the name of the message type.

  The service timestamps log datetime msec command specifies that a timestamp up to the millisecond should be included in all messages that include the time.

  While the logging console level command can be used with a level number on some devices, notifications are level 5, not 4.

  The service timestamps log datetime command specifies that a timestamp should be included in all messages, but it will not include the millisecond. Better logging functionality can be achieved by using the msec keyword to help organize tightly spaced events.

  The logging history command can specify the proper level of messages to reduce unnecessary messages.

  Objective:

  Infrastructure Services

  Sub-Objective:

  Configure and verify logging

  References:

  Catalyst 2960 and 2960-S Software Configuration Guide, 12.2(55)SE > Configuring System Message Logging Cisco > Cisco IOS Embedded Syslog Manager Command Reference > logging console Cisco > Cisco IOS Configuration Fundamentals Command Reference > R through setup > service timestamps

• Question 286:

  Refer to the exhibit. The static route is not present in the routing table of an adjacent OSPF neighbor router. Which action resolves the issue?

  

  A. Configure the next hop of 10.20.20.1 in the prefix list DMZ-STATIC
  B. Configure the next-hop interface at the end of the static router for it to get redistributed
  C. Configure a permit 20 statement to the route map to redistribute the static route
  D. Configure the subnets keyword in the redistribution command
  D. Configure the subnets keyword in the redistribution command

• Question 287:

  What are two functions of MPLS Layer 3 VPNs? (Choose two.)

  A. LDP and BGP can be used for Pseudowire signaling.
  B. It is used for transparent point-to-multipoint connectivity between Ethernet links/sites.
  C. BGP is used for signaling customer VPNv4 routes between PE nodes.
  D. A packet with node segment ID is forwarded along with shortest path to destination.
  E. Customer traffic is encapsulated in a VPN label when it is forwarded in MPLS network.
  C. BGP is used for signaling customer VPNv4 routes between PE nodes.
  E. Customer traffic is encapsulated in a VPN label when it is forwarded in MPLS network.

  ---

  MPLS Layer-3 VPNs provide IP connectivity among CE sites

  *

  MPLS VPNs enable full-mesh, hub-andspoke, and hybrid IP connectivity

  *

  CE sites connect to the MPLS network via IP peering across PE-CE links

  *

  MPLS Layer-3 VPNs are implemented via VRFs on PE edge nodes

  *

  VRFs providing customer routing and forwarding segmentation

  *

  BGP used for signaling customer VPN (VPNv4) routes between PE nodes

  *

  To ensure traffic separation, customer traffic is encapsulated in an additional VPN label when forwarded in MPLS network

  *

  Key applications are layer-3 business VPN services, enterprise network segmentation, and segmented layer-3 Data Center access

• Question 288:

  Refer to the exhibit.

  

  The network administrator configured the network to establish connectivity between all devices and notices that the ASBRs do not have routes for each other. Which set of configurations resolves this issue?

  

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

• Question 289:

  Refer to the exhibit.

  

  The IT router has been configured with the Science VRF and the interfaces have been assigned to the VRF

  Which set of configurations advertises Science-1 and Science-2 routes using EIGRPAS 111?

  A. router eigrp 111 address-family ipv4 vrf Science autonomous-system 1 network 192.168.1.0 network 192.168.2.0
  B. router eigrp 111 address-family ipv4 vrf Science network 192.168.1.0 network 192.168.2.0
  C. router eigrp 111 network 192.168.1.0 network 192.168.2.0
  D. router eigrp 1 address-family ipv4 vrf Science autonomous-system 111 network 192.168.1.0 network 192.168.2.0
  D. router eigrp 1 address-family ipv4 vrf Science autonomous-system 111 network 192.168.1.0 network 192.168.2.0

• Question 290:

  Which configuration feature should be used to block rogue router advertisements instead of using the IPv6 Router Advertisement Guard feature?

  A. VACL blocking broadcast frames from nonauthorized hosts
  B. PVLANs with promiscuous ports associated to route advertisements and isolated ports for nodes
  C. PVLANs with community ports associated to route advertisements and isolated ports for nodes
  D. IPv4 ACL blocking route advertisements from nonauthorized hosts
  B. PVLANs with promiscuous ports associated to route advertisements and isolated ports for nodes

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  The IPv6 Router Advertisement Guard feature provides support for allowing the network administrator to block or reject unwanted or rogue router advertisement guard messages that arrive at the network device platform. Router Advertisements are used by devices to announce themselves on the link. The IPv6 Router Advertisement Guard feature analyzes these router advertisements and filters out router advertisements that are sent by unauthorized devices. Certain switch platforms can already implement some level of rogue RA filtering by the administrator configuring Access Control Lists (ACLs) that block RA ICMP messages that might be inbound on "user" ports.