Cisco 300-410 Online Practice Questions and Exam Preparation

Cisco 300-410 Online Questions & Answers

• Question 411:

  You execute the debug ip packet command and find that you receive no output. Which of the following is the MOST likely reason?

  A. someone executed the no ip route-cache command
  B. someone executed the no ip mroute cache command
  C. someone attached an extended access list to the debug process
  D. someone executed the ip cef command
  D. someone executed the ip cef command

  ---

  When the ip cef command is executed, it enables Cisco Express Forwarding. When CEF is enabled, packets are no longer switched to the processor, so the output shows nothing. You must disable CEF and fast switching on the interface while you are running the debug ip packet command.

  Executing the no ip route-cache command would disable fast switching and would enable the gathering of packets rather than disable the operation.

  Executing the no ip-mroute cache command would disable fast switching of multicast packets and would enable the gathering of multicast packets.

  While it is possible that that an overly restrictive access list could result in NO output, this is only a possibility. On the other hand, it is certain that no output will be produced if the ip cef command was executed. Access lists SHOULD be used in conjunction with the debug ip packet command to reduce the significant amount of information generated and the system resources required to do so.

  Objective:

  Infrastructure Services

  Sub-Objective:

  Configure and verify logging

  References:

  Home > Support > Technology support > Dial and access > Integrated Services Digital Networks (ISDN) Channel-Associated Signaling (CAS) > Troubleshoot and alerts > Troubleshooting Technotes > Important Information on Debug Commands

  Cisco > Cisco IOS IP Switching Command Reference > ip cache-invalidate-delay through monitor event-trace cef ipv6 global > ip cef

• Question 412:

  SIMULATION

  Guidelines

  This is a lab item in which tasks will be performed on virtual devices.

  1. Refer to the Tasks tab to view the tasks for this lab item.

  2. Refer to the Topology tab to access the device console(s) and perform the tasks.

  3. Console access is available for all required devices by clicking the device icon or using the tab(s) above the console window.

  4. All necessary preconfigurations have been applied.

  5. Do not change the enable password or hostname for any device.

  6. Save your configurations to NVRAM before moving to the next item.

  7. Click Next at the bottom of the screen to submit this lab and move to the next question.

  8. When Next is clicked, the lab closes and cannot be reopened.

  Topology

  

  Tasks

  Troubleshoot R-WEST to achieve the desired results:

  1. The locally generated logs should have sequence numbers, date and time.

  2. The SNMP traps related to OSPF and participating interface state changes utilizing RFC1253-MIB OSPFv2 should be sent to SNMP server.

  

  A. See the solution below in Explanation.
  B. PlaceHolder
  C. PlaceHolder
  D. PlaceHolder
  A. See the solution below in Explanation.

  ---

  

• Question 413:

  You need to configure a Cisco router to act as a DHCP server and provide the following services:

  1. Hand out IP addresses for subnet 10.10.0.0/16

  2. Set the domain name for the clients to "Cisco"

  3. Set the DNS server to 10.10.0.1

  4. Set the default gateway to 10.10.0.1

  5. Prevent IP address conflicts with 6 print servers that have consecutive permanently assigned addresses starting at 10.10.0.20.

  Which of the following sets of commands will successfully accomplish this?

  A. Router1(config)# service dhcp Router1(config)# ip dhcp pool IPPool Router1(dhcp-config)# network 10.10.0.0 255.255.0.0 Router1(dhcp-config)# domain-name Cisco Router1(dhcp-config)# dns-server 10.10.0.1 Router1(dhcp-config)# default-router 10.10.0.1 Router1(dhcp-config)# exit Router1(config)# ip dhcp excluded-address 10.10.0.20 10.10.0.25
  B. Router1(config)# service dhcp Router1(config)# dhcp pool IPPool Router1(dhcp-config)# network 10.10.0.0 255.255.0.0 Router1(dhcp-config)# domain-name Cisco Router1(dhcp-config)# dns-server 10.10.0.1 Router1(dhcp-config)# default-router 10.10.0.1 Router1(dhcp-config)# exit Router1(config)# ip dhcp excluded-address 10.10.0.20 10.10.0.25
  C. Router1(config)# service dhcp Router1(config)# ip dhcp pool IPPool Router1(dhcp-config)# network 10.10.0.0 255.255.0.0 Router1(dhcp-config)# domain-name Cisco Router1(dhcp-config)# dns-server 10.10.0.1 Router1(dhcp-config)# default-gateway 10.10.0.1 Router1(dhcp-config)# exit Router1(config)# ip dhcp excluded-address 10.10.0.20 10.10.0.25
  D. Router1(config)# service dhcp Router1(config)# ip dhcp pool IPPool Router1(dhcp-config)# network 10.10.0.0 255.255.0.0 Router1(dhcp-config)# domain-name Cisco Router1(dhcp-config)# dns-server 10.10.0.1 Router1(dhcp-config)# default-router 10.10.0.1 Router1(dhcp-config)# exit Router1(config)# ip dhcp excluded-address 10.10.0.20 - 10.10.0.25
  A. Router1(config)# service dhcp Router1(config)# ip dhcp pool IPPool Router1(dhcp-config)# network 10.10.0.0 255.255.0.0 Router1(dhcp-config)# domain-name Cisco Router1(dhcp-config)# dns-server 10.10.0.1 Router1(dhcp-config)# default-router 10.10.0.1 Router1(dhcp-config)# exit Router1(config)# ip dhcp excluded-address 10.10.0.20 10.10.0.25

  ---

  The following command sequence is correct:

  Router1(config)# service dhcp

  Router1(config)# ip dhcp pool IPPool

  Router1(dhcp-config)# network 10.10.0.0 255.255.0.0

  Router1(dhcp-config)# domain-name Cisco

  Router1(dhcp-config)# dns-server 10.10.0.1

  Router1(dhcp-config)# default-router 10.10.0.1

  Router1(dhcp-config)# exit

  Router1(config)# ip dhcp excluded-address 10.10.0.20 10.10.0.25

  The Router1(config)# service dhcp command enables the DHCP process. It is enabled by default, but this command may be needed if it has been disabled.

  The Router1(config)# ip dhcp pool IPPool command creates a DHCP pool named IPPool.

  The Router1(dhcp-config)# network 10.10.0.0 255.255.0.0 command specifies the subnet and mask for which the DHCP process will be handing out IP addresses. Unless otherwise specified, it is assumed that the assignment will start with the first address on the subnet and end with the last address on the subnet; in this case, 10.10.0.1 through 10.10.0.255.

  The Router1(dhcp-config)# domain-name Cisco command sets the domain name for the clients to "Cisco."

  The Router1(dhcp-config)# dns-server 10.10.0.1 command sets the DNS server IP address for the clients to 10.10.0.1.

  The Router1(dhcp-config)# default-router 10.10.0.1 command sets the default gateway for the clients to 10.10.0.1.

  The Router1(dhcp-config)# exit command exits back to global config mode.

  The Router1(config)# ip dhcp excluded-address 10.10.0.20 10.10.0.25 command configures the DHCP process not to hand out addresses 10.10.0.20 through 10.10.0.25 so that there is no conflict with the print servers. This command is technically not a dhcp-config command, but if it is issued in the dhcp-config mode, the router will exit to global config mode and invoke the command.

  The other options are incorrect due to incorrect syntax or command mode.

  Objective:

  Infrastructure Services

  Sub-Objective:

  Configure and verify IPv4 and IPv6 DHCP

  References:

  Cisco > Cisco IOS IP Addressing Services Configuration Guide, Release 12.4 > Part 3: DHCP > DHCP Overview

• Question 414:

  Which of the following commands need to be configured on a RIPng router prior to enabling this routing protocol?

  A. ipv6 rip enable
  B. ipv6 multicast-routing
  C. ipv6 unicast-routing
  D. ipv6 router rip
  C. ipv6 unicast-routing

  ---

  The ipv6 unicast-routing command should be used before enabling RIPng on a router. This command should be executed in global configuration mode of the router. IPv6 can then be enabled by using the ipv6 enable command on any of the interfaces of the router. The ipv6 unicast-routing command allows you to forward IPv6 unicast datagrams.

  Routing Information Protocol Next Generation (RIPng) allows routers to learn about routes in an autonomous system. RIPng is an extension of the RIPv2 protocol to provide support IPv6 for future adherence.

  The similarities between RIPv2 and RIPng are as follows:

  Both protocols use User Datagram Protocol (UDP).

  Both use distance vector algorithm to find the best route.

  Both of them measure the metric in terms of hops.

  Both have the same maximum hop count of 15 for valid routes.

  The differences between RIPv2 and RIPng are as follows:

  RIPv2 learns IPv4 routes, whereas RIPng learns IPv6 routes

  RIPv2 supports automatic summarization as IPv4 defines classful addresses, whereas RIPng does not support automatic summarization RIPv2 uses UDP port 520, whereas RIPng supports port 521 RIPv2 requires authentication for RIP packets, whereas RIPng does not require RIP-specific authentication as IPv6 has an in-built IPsec authentication

  The ipv6 rip enable command should not be used because this command allows you to enable IPv6 RIP routing process on the interfaces of a router.

  You should not use the ipv6 multicast-routing command prior to enabling IPv6 on the router. This command is used after IPv6 is enabled on one or more interfaces of the router to allow multicast forwarding using Protocol Independent Multicast (PIM) and Multicast Listener Discovery (MLD) on all the IPv6-enabled interfaces.

  The ipv6 router rip command should not be used prior to enabling IPv6 because it allows you to enter the RIP for IPv6 router mode.

  Objective:

  Layer 3 Technologies

  Sub-Objective:

  Describe RIPng

  References:

  Cisco > Configuring IPv6 Routing

  Cisco > Cisco IOS IPv6 Command Reference > ipv6 unicast-routing

• Question 415:

  Which show command displays detailed information about a router's BGP connections to neighboring routers?

  A. show ip bgp
  B. show ip bgp summary
  C. show ip bgp neighbors
  D. show ip bgp connections
  C. show ip bgp neighbors

  ---

  The show ip bgp neighbors command will show you detailed information about all of the router's neighbors or peers. A sample of the show ip bgp neighbors output is shown below. The sample utilizes the ip address parameter, which is optional, but can used to limit the output to display information about only one neighbor:

  

  In the above example, router15 has sent out a BGP open packet to the peer at 10.5.1.6 and is listening for a connection request from the peer. This can be determined by the line that says BGP state = Active. It can also be determined that router has established a TCP connection two times, as evidenced by the line Connections established 2.

  The show ip bgp command displays the contents of the BGP routing table. It will not display detailed information about a router's BGP connections to neighboring routers.

  The show ip bgp summary command displays a summary of the status of BGP connections. It will not display detailed information about a router's BGP connections to neighboring routers.

  There is no show ip bgp connections command.

  Objective:

  Layer 3 Technologies

  Sub-Objective:

  Describe, configure, and verify BGP peer relationships and authentication

  References:

  Cisco IOS Master Command List, Release 12.4 > a through b > BGP Commands: show ip through T > show ip bgp neighbors

• Question 416:

  You configured a device as an IP SLA responder using the following configuration:

  

  Which line indicates that the device is not a Cisco device?

  A. frequency 30
  B. timeout 1000
  C. tcp-connect 10.0.0.1 23 control disable
  D. tag FLL-RO
  C. tcp-connect 10.0.0.1 23 control disable

  ---

  The IP SLA TCP connect operation is used to gather statistics on connection-oriented services. The tcp- connect 10.0.0.1 23 control disable command specifies the IP address to which the responder should respond, the port number on which to respond and it disables the control protocol normally used to inform the responder to temporarily enable the port specified .by the configuration in the sender. When the responder is a non-Cisco device, a well-known port number must be chosen and the control

  protocol should be disabled on the responder. When a Cisco device is the responder, then any port number can be chosen and the control protocol should be left enabled.

  The frequency 30 command specifies how often the test should occur in seconds. It is not changed in any way as a result of the responder being a non-Cisco device.

  The timeout 1000 command specifies in milliseconds the amount of time an IP SLAs operation waits for a response from its request packet. It is not changed in any way as a result of the responder being a non-Cisco device.

  The tag FLL-RO command simply applies a user-specified identifier to the IP SLAs operation and is changed in any way as a result of the responder being a non-Cisco device.

  Objective:

  Infrastructure Services

  Sub-Objective:

  Configure and verify IP SLA

  References:

  IP SLAs Configuration Guide, Cisco IOS Release 15MandT > Configuring IP SLAs TCP Connect Operations Cisco > Cisco IOS IP SLAs Command Reference > tcp-connect

• Question 417:

  What are the two benefits of using BFD? (Choose two.)

  A. synchronous path determination
  B. subsecond failure detection
  C. supports ail routing protocols
  D. supports UDLD failure
  E. forwarding path failure detection
  B. subsecond failure detection
  E. forwarding path failure detection

• Question 418:

  Which of the following IPv4 to IPv6 migration techniques does not separate DNS and the translation process?

  A. NAT-PT
  B. stateless NAT64
  C. stateful NAT64
  D. MAP-T
  A. NAT-PT

  ---

  Network Address Translation-Protocol Translation (NAT-PT) and DNS are inseparable, which is one of the reasons why NAT-PT has been deprecated. Network Address Translation IPv6 to IPv4, or NAT64, is superior to the NAT-PT technique because this solution has complete separation of the functions of NAT64 and DNS64.

  Stateless NAT64 is a version of NAT64 that does not maintain a binding or session state when it performs Address Family Translation (AFT). As such, it cannot be used in some of the implementations in which stateful NAT 64 can. However, in this method, DNS and the translation process are independent.

  Stateful NAT64 creates or modifies bindings or session state while performing translation. For this reason, it can be used to translate from an IPv4 network to an IPv6 network if static mappings are created, which stateless NAT64 cannot.

  Mapping of Address and Ports using Translation (MAP-T) is a method of creating mappings to provide connectivity for IPv4 hosts across an IPv6 domain. Its operation is not connected to DNS.

  Objective:

  Infrastructure Services

  Sub-Objective:

  Describe IPv6 NAT

  References:

  Home > Products and services > Cisco IOS and nx-os software > Cisco IOS technologies > Enterprise IPv6 solutions > Data sheets and literature > NAT64 Technology: Connecting IPv6 and IPv4 Networks

• Question 419:

  How does LDP operate in an MPLS network?

  A. When topology changes occur such as a router failure, LDP generates peer discovery messages that terminate the LDP season to propagate an LSP change.
  B. When an adjacent LSR receives LDP discovery messages. TCP two-way handshake ensures that the LDP session has unidirectional connectivity.
  C. Peer routers establish the LDP session, and the LDP neighbors maintain and terminate the session by exchanging messages
  D. LDP notification messages allow LERs to exchange label information to determine the next hops within a particular LSP.
  D. LDP notification messages allow LERs to exchange label information to determine the next hops within a particular LSP.

• Question 420:

  What TCP port is used by LDP to provide for reliable transport connections?

  A. 646
  B. 648
  C. 752
  D. 712
  A. 646