Cisco 300-410 Online Practice Questions and Exam Preparation

Cisco 300-410 Online Questions & Answers

• Question 211:

  You are configuring EIGRP on a spoke router in a hub-and-spoke topology. In an effort to keep the routing table small, the hub router has been configured to send only a default route to the remote routers.

  What command would you use on the spoke routers to enable them to send only connected and summary routes to the hub router, and prevent the hub router from sending a query to the spoke router when a route is lost elsewhere?

  A. eigrp stub
  B. eigrp stub static
  C. eigrp passive
  D. eigrp stub receive-only
  A. eigrp stub

  ---

  The eigrp stub command is used to configure a router to send only connected and summary routes to its neighboring router. For example, examine the following output of the show ip route command that was executed on a router configured as a stub router:

  router10#show ip route

  C 172.16.5.0/24 is directly connected, Serial 0

  D 192.168.7.0/24 [90/16523564] via 172.16.4.1, 00:21:20, Serial 1 D 172.16.0.0/16 is a summary, 00:21:23, Null 0

  C 172.16.4.0/24 is directly connected, Serial 2

  The routes that will be advertised are 172.16.5.0/24, 172.16.4.0/24, and the summary route 172.16.0.0/16. The first two is directly connected routes, and the last is the summary route that is auto configured by the EIGRP process.

  When the stub feature is enabled on a router, the router will announce itself as a stub router. Neighbor routers will not query a stub router for alternate routes when a route is lost elsewhere in the network. The EIGRP stub feature works well in hub-and-spoke topologies when the goal is to minimize the amount of EIGRP bandwidth and processing associated with the spoke router. The eigrp stub command has the following syntax:

  eigrp stub [receive-only | connected | static | summary]

  When you do not specify any keywords with the command, connected and summary are used by default. receive-only: Prevents the router from sending any connected or summary routes.

  connected: Instructs the router to send connected routes.

  static: Instructs the router to send static routes that were redistributed by using the redistribute static command.

  summary: Instructs the router to send summary routes.

  These parameters can be combined to resolve various problems, as seen in the following image:

  

  Router A is not receiving the route to the 172.16.1.0/16 network because Router B, which stands between Router A and C, is configured with the eigrp stub-receive-only command. This is resulting in hosts from the corporate office being unable to connect to hosts in the 172.16.0.0/16 network. If there were a legitimate reason to keep Router B configured with the eigrp stub-receive-only command, the problem could be solved by executing the following command set on Router

  A:

  routerA(config)# router eigrp 20

  routerA(config-router)# ip summary-address eigrp 20 172.16.0.0 255.255.0.0 routerA(config-router)# eigrp stub connected summary

  This command set would create a summary address for the 172.16.0.0/16 network and then advertise it to the corporate office as a result of using the eigrp stub connected summary command. The inclusion of the connected parameter ensures that the directly connected networks will also be advertised, to ensure that hosts in the corporate office can reach the 172.16.0.0/16 network.

  The eigrp stub static command instructs the router to send static routes that were redistributed by using the redistribute static command. Examine the EIGRP configuration shown below:

  ip route 10.4.4.0 255.255.255.0 10.4.3.10

  Route eigrp 200

  No auto-summary

  Redistribute static 1000 1 255 1 1500

  Network 10.4.1.0 0.0.0.3.

  Network 10.4.2.0 0.0.0.255

  Eigrp stub static

  With this configuration, the router would not advertise any of the networks defined in the network statements, but would only advertise the static route configured with the line ip route 10.4.4.0 255.255.255.0 10.4.3.10.

  Eigrp passive is not a valid Cisco command.

  Eigrp stub receive-only will cause the router to not advertise any routes. The router will only receive updates.

  Objective:

  Layer 3 Technologies

  Sub-Objective:

  Configure and verify EIGRP stubs

  References:

  Cisco IOS Master Command List, Release 12.4 > e through h > eigrp stub

• Question 212:

  Router 5 has four interfaces. The networks hosted on each interface are as follows:

  Fa0/1 192.168.5.4/29 Fa0/2 192.168.6.0/24 Fa0/3 192.168.7.0/24 S0/0 172.16.5.0/24

  You execute the following commands on the router:

  

  After this command sequence is executed, what routes will be present in the routing table of the router at 172.16.5.2? (Choose all that apply.)

  A. 192.168.5.4/29
  B. 172.16.5.0/24
  C. 192.168.6.0/24
  D. 192.168.7.0/24
  E. none of these will be present
  F. only network addresses beginning with 192 will be present
  A. 192.168.5.4/29
  B. 172.16.5.0/24
  C. 192.168.6.0/24
  D. 192.168.7.0/24

  ---

  Despite the inclusion of the command aggregate-address 192.168.5.0 255.255.252.0, all subnets of the aggregate route will also be placed in the routing updates because of the omission of the summary-only keyword. Therefore, 192.168.5.4/29, 172.16.5.0/16, 192.168.6.0/24 and 192.168.7.0/24 will be present.

  Had the following command been executed, the subnet addresses would not appear in the routing table of the router at 172.16.5.2:

  Router5(config-router)# aggregate-address 192.168.5.0 255.255.252.0 summary-only

  Therefore, both the aggregate address and all of the 192.168.0.0 subnets will be in the routing table.

  The 172.16.5.0/24 network will be in the routing table of the router at 172.160.5.1 because it is directly connected.

  Objective:

  Layer 3 Technologies

  Sub-Objective:

  Configure and verify manual and autosummarization with any routing protocol

  References:

  Cisco > Cisco IOS IP Routing: BGP Command Reference > aggregate-address

• Question 213:

  Refer to the exhibit. An engineer must advertise routes into IPv6 MP-BGP and failed. Which configuration resolves the issue on R1?

  

  A. router bgp 65000 no bgp default ipv4-unicast address-family ipv6 multicast network 2001:DB8::/64
  B. router bgp 65000 no bgp default ipv4-unicast address-family ipv6 unicast network 2001:DB8::/64
  C. router bgp 64900 no bgp default ipv4-unicast address-family ipv6 multicast neighbor 2001:DB8:7000::2 translate-update ipv6 multicast
  D. router bgp 64900 no bgp default ipv4-unicast address-family ipv6 unicast redistribute ospf network 2001:DB9::/64
  B. router bgp 65000 no bgp default ipv4-unicast address-family ipv6 unicast network 2001:DB8::/64

• Question 214:

  Refer to the exhibit.

  

  Which subnet is redistributed from EIGRP to OSPF routing protocols?

  A. 10.2.2.0/24
  B. 10.1.4.0/26
  C. 10.1.2.0/24
  D. 10.2.3.0/26
  A. 10.2.2.0/24

  ---

• Question 215:

  What is a limitation of IPv6 RA Guard?

  A. It is not supported in hardware when TCAM is programmed
  B. It does not offer protection in environments where IPv6 traffic is tunneled.
  C. It cannot be configured on a switch port interface in the ingress direction
  D. Packets that are dropped by IPv6 RA Guard cannot be spanned
  B. It does not offer protection in environments where IPv6 traffic is tunneled.

  ---

  Restrictions for IPv6 RA Guard

  The IPv6 RA Guard feature does not offer protection in environments where IPv6 traffic is tunneled.

  This feature is supported only in hardware when the ternary content addressable memory (TCAM) is programmed.

  This feature can be configured on a switch port interface in the ingress direction.

  This feature supports host mode and router mode.

  This feature is supported only in the ingress direction; it is not supported in the egress direction.

  This feature is not supported on EtherChannel and EtherChannel port members.

  This feature is not supported on trunk ports with merge mode.

  This feature is supported on auxiliary VLANs and private VLANs (PVLANs). In the case of PVLANs, primary VLAN features are inherited and merged with port features.

  Packets dropped by the IPv6 RA Guard feature can be spanned.

  https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6_fhsec/configuration/xe-16-10/ip6f-xe-16- 10-book/ip6-ra-guard.html#GUID-589AF00C-7499-439F-AD23-51005D61CAB7

• Question 216:

  An engineer needs dynamic routing between two routers and is unable to establish OSPF adjacency. The output of the show ip ospf neighbor command shows that the neighbor state is EXSTART/EXCHANGE. Which action should be taken to resolve this issue?

  A. match the passwords
  B. match the hello timers
  C. match the MTUs
  D. match the network types
  C. match the MTUs

  ---

  The problem occurs most frequently when attempting to run OSPF between a Cisco router and another vendor's router. The problem occurs when the maximum transmission unit (MTU) settings for neighboring router interfaces don't match. If the router with the higher MTU sends a packet larger that the MTU set on the neighboring router, the neighboring router ignores the packet.

• Question 217:

  Which two features are required for MPLS forwarding on which types of routers? (Choose two.)

  A. MPLS on PE and core routers
  B. LDP on PE and core routers
  C. MPLS on CE and core routers
  D. LDP on PE and CE routers
  E. CEF on PE and CE routers
  A. MPLS on PE and core routers
  B. LDP on PE and core routers

• Question 218:

  After configuring a PPPoE client on and Ethernet interface, you discover the connection is not working. You execute the show run command to view the PPPoE configuration, part of which is shown in the following output:

  

  What command is missing?

  A. vpdn-group
  B. request dialin
  C. protocol pppoe
  D. vpdn enable
  D. vpdn enable

  ---

  The command vpdn enable is required to enable virtual private dialup networking. If this command has not been executed, the other commands will not take effect. While some commands are optional, the following tasks are required to set up the PPP over Ethernet client feature: Enable PPPoE in a VPDN Group Configure a PPPoE Client Configure the Dialer Interface

  The first step includes these three sub-tasks:

  1. Enable virtual private dialup networking using the vpdn enable command.

  2. Associate a VPDN group with a customer or VPDN profile using the vpdn-group name command.

  3. Create a request-dialin VPDN subgroup using the request-dialin command.

  4. Enable the VPDN subgroup to establish PPPoE sessions using the protocol pppoe command.

  In the output in the scenario, we can see that all tasks were taken care of in the first section except for enabling virtual private dialup networking. Had hat been done, the first section would correctly appear as:

  vpdn enable

  vpdn-group 1

  request-dialin

  protocol pppoe

  !

  The rest of the configuration is correct. The following section configures the PPPoE client and specifies the dialer interface to use for cloning:

  interface ethernet1/1

  pppoe-client dial-pool-number 1

  pppoe-client dial-pool-number 2

  The following sections configure two dialer interfaces. They specify that the IP addresses for the interfaces are obtained via PPP/IPCP (IP Control Protocol) address negotiation and that the dialing pools to use to connect to a specific destination subnetwork. Finally, they configure the interfaces to belong to a specific dialing group.

  !

  interface dialer 1

  ip address negotiated

  dialer pool 1

  dialer-group 1

  !

  interface dialer 2

  ip address negotiated

  dialer pool 2

  dialer-group 2

  Objective:

  Layer 2 Technologies

  Sub-Objective:

  Configure and verify PPP

  References:

  Cisco Press > Articles > Cisco Network Technology > General Networking > End-to-End DSL Architectures PPP over Ethernet Client

• Question 219:

  Refer to the exhibit. Customer B has decided not to receive any routes from R1 that originated outside the AS 100. Which AS path access list must the engineer choose to meet this requirement?

  

  

  A. ip as-path access-list 1 permit ^10[0-9]*$
  B. ip as-path access-list 1 permit ^100$
  C. ip as-path access-list 1 permit _100$
  D. ip as-path access-list 1 permit _100_
  B. ip as-path access-list 1 permit ^100$

• Question 220:

  An engineer must configure encrypted packets for a single router OSPF neighborship. Which configuration meets this requirement?

  

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