Cisco 300-410 Online Practice Questions and Exam Preparation

Cisco 300-410 Online Questions & Answers

• Question 701:

  Refer to the exhibit.

  

  A network engineer configured routers R1 and R2 with MP-BGP. The engineer noticed that the routers cannot exchange any IPv6 routes; however, the IPv4 neighbor relationship is working fine. Which configuration must the engineer apply to router R2 to exchange IPv6 routes?

  A. ipv6 unicast-routing ipv6 cef ! interface Loopback100 ipv6 address 2001:DB8:128::2/128 ! interface GigabitEthernet1/0 ipv6 address 2001:DB8:1::2/64 ! router bgp 65002 no bgp default ipv4-unicast neighbor 2001:DB8:1::1 remote-as 65001 ! address-family ipv6 network 2001:DB8:128::2/128
  B. ipv6 unicast-routing ipv6 cef ! interface Loopback100 ipv6 address 2001:DB8:128::2/128 ! interface GigabitEthernet1/0 ipv6 address 2001:DB8:1::2/64 ! router bgp 65002 no bgp default ipv4-unicast neighbor 2001:DB8:1::1 remote-as 65001 ! address-family ipv6 network 2001:DB8:128::2/128 neighbor 2001:DB8:1::1 activate
  C. ipv6 unicast-routing ipv6 cef ! interface Loopback100 ipv6 address 2001:DB8:128::2/128 ! interface GigabitEthernet1/0 ipv6 address 2001:DB8:1::2/64 description AS65001 ID B463:A68D:9D4::8 ! router bgp 65002 no bgp default ipv4-unicast neighbor 2001:DB8:1::1 remote-as 65001 ! address-family ipv4 neighbor 2001:DB8:1::1 activate
  D. ipv6 cef ! interface Loopback100 ipv6 address 2001:DB8:128::2/128 ! interface GigabitEthernet1/0 ipv6 address 2001:DB8:1::2/64 ! router bgp 65002 no bgp default ipv4-unicast neighbor 2001:DB8:1::1 remote-as 65001 ! address-family ipv6 network 2001:DB8:128::2/128 neighbor 2001:DB8:1::1 activate
  B. ipv6 unicast-routing ipv6 cef ! interface Loopback100 ipv6 address 2001:DB8:128::2/128 ! interface GigabitEthernet1/0 ipv6 address 2001:DB8:1::2/64 ! router bgp 65002 no bgp default ipv4-unicast neighbor 2001:DB8:1::1 remote-as 65001 ! address-family ipv6 network 2001:DB8:128::2/128 neighbor 2001:DB8:1::1 activate

• Question 702:

  Which of the following are valid IPv4 to IPv6 migration strategies? (Choose two.)

  A. DHCP
  B. Tunnels
  C. Dual-stack
  D. Encapsulating IPv4 into IPv6
  B. Tunnels
  C. Dual-stack

  ---

  Tunnels and dual-stack are valid IPv4 to IPv6 migration strategies.

  Tunneling mechanisms can transport IPv6 across an IPv4 infrastructure. Cisco supports the following types of tunneling for this purpose:

  Manual tunnels

  Generic Routing Encapsulation (GRE) tunnels

  IPv4 compatible tunnels

  6-to-4 tunnels

  Intra-Site Automatic Tunnel Addressing Protocol (ISATAP) tunnels

  For all tunneling types, IPv6 packets are encapsulated in IPv4 packets for delivery across the IPv4 infrastructure. These tunnels require two endpoints, either two routers, or a router and a host. Both endpoints must support IPV4 and IPv6.

  When implementing an automatic 6-to-4 tunnel each IPv6 site receives a /48-bit prefix. The hexadecimal equivalent of the IPv4 address of the edge router is appended to 0x2002 and followed with the prefix to identify each end of the tunnel. Each end of the tunnel must be a dual stack router, that is, one that can route both IPv4 and IPv6. For example if the edge router's IPv4 address were 192.168.99.1, the hexadecimal equivalent of the address (c0a8:6301) would be inserted between 0X2002 and the /48

  prefix, resulting in 2002:c0a8:6301:: /48 to arrive at the tunnel endpoint address.

  The following example shows a partial output of the show run command executed on a router hosting one end of a 6-to-4 tunnel:

  

  The least significant 32 bits in the address referenced by the ipv6 route 2002::/16 Tunnel0 command correspond to the IPv4 address (64.101.64.1) assigned to the tunnel source. The hex equivalent is 4065:4001, yielding 2002:4065:4001::/48. Another example of how IPv4 addresses can be used in the creation of the tunnel endpoint IPv6 identifier is shown in the partial output of the show run command executed on a router that is hosting one end of an automatic IPv4 compatible tunnel:

  

  In the neighbor statement under the BGP configuration section, the neighbor address is derived from the IPv4 address of the other router (192.168.4.1). This could be implemented in one of three ways: ::192.168.4.1

  0:0:0:0:0:0:192.168.4.1 ::c0a8:0401

  The IPv6 addresses ::192.168.4.1 and 0:0:0:0:0:0:192.168.4.1 are implemented by inserting the IP address at either the end of :: or 0:0:0:0:0:0. (:: is a IPv6 shortcut for 0:0:0:0:0:0). The IPv6 address::c0a8:0401 is implemented by inserting the hex equivalent of 192.168.4.1 (c0a8:0401) in the same location.

  Another potential migration strategy is to run dual stacks. The TCP/IP stack, or stack, is the TCP/IP software that is included in most operating systems. It is possible to run dual TCP/IP stacks on a computer. For example, servers and other infrastructure equipment often run both an IPv4 and IPv6 IP stack for application compatibility. This dual-stack configuration allows applications that require IPv6 to use the IPv6 stack and applications that require IPv4 to use the IPv4 stack.

  The following partial output of the show run command shows the configuration of a dual stack router:

  ipv6 unicast routing

  interface fastethernet0/0

  ip address 192.168.5.1 255.255.255.0

  ipv6 address 3ffe:b00:c19:2::3/127

  This configuration allows applications on the same segment to communicate via IPv4 or IPv6.

  Dynamic Host Configuration Protocol (DHCP) provides no benefits in migrating from IPv4 to IPv6.

  IPv4 is not encapsulated in IPv6 in any of the migration strategies. IPv6 is encapsulated into IPv4.

  Objective:

  Network Principles

  Sub-Objective:

  Recognize proposed changes to the network

  References:

  Cisco > Cisco IOS IPv6 Implementation Guide, Release 12.4 > Implementing Tunneling for IPv6

• Question 703:

  Refer to the exhibit.

  

  Which action resolves the adjacency issue?

  A. Configure the same EIGRP process IDs.
  B. Match the authentication keys.
  C. Match the hello interval timers.
  D. Configure the same autonomous system numbers
  D. Configure the same autonomous system numbers

• Question 704:

  What are the two goals of micro BFD sessions? (Choose two.)

  A. The high bandwidth member link of a link aggregation group must run BFD.
  B. Any member link on a link aggregation group must run BFD.
  C. Continuity for each member link of a link aggregation group must be verified.
  D. Run the BFD session with 3x3 ms hello timer.
  E. Each member link of a link aggregation group must run BFD.
  C. Continuity for each member link of a link aggregation group must be verified.
  E. Each member link of a link aggregation group must run BFD.

  ---

  https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bfd/configuration/xe-16-8/irb-xe-16-8-book/irb-micro-bfd.html

  The goal of micro BFD sessions are:

  -Run BFD session over each LAG member link.

  -Verify link continuity for each member link.

  - Allow BFD to control the LAG member link to be part of the L2 load-balancing table of the LAG interface in the presence or absence of LACP.

• Question 705:

  What would be a use case for the HSRP configuration below?

  

  A. used to switch the active role to the other router in the HSRP group during a maintenance window
  B. used to prevent this router from ever relinquishing the active role
  C. used to prevent this router from ever performing the active role
  D. used to allow preemption over multiple peers
  A. used to switch the active role to the other router in the HSRP group during a maintenance window

  ---

  By tracking the loopback interface and decrementing the priority if it goes down, technicians would have a method of moving the active role to the other router by disabling the loopback interface. This method is less disruptive than disabling any of the physical interfaces. Although no decrement value has been specified, a default decrement of 10 will occur.

  This configuration would not be used to prevent this router from ever relinquishing the active role. That would defeat the purpose of Hot Standby Routing Protocol (HSRP), which is to provide failover by relinquishing the active role to the other router.

  This configuration would not be used to prevent this router from ever performing the active role. That would defeat the purpose of HSRP which is to provide failover by this router taking the active role when there is an issue with the other router.

  This configuration would not be used to allow preemption over multiple peers. When more than two routers are in an HSRP group, the active router is allowed preemption over multiple peers by default.

  Objective:

  Infrastructure Services

  Sub-Objective:

  Configure and verify tracking objects

  References:

  Home > Support > Technology support > IP > IP application services > Troubleshoot and alerts > Troubleshooting Technotes > How to use the standby preempt and standby track commands

• Question 706:

  Which two protocols work in the control plane of P routers across the MPLS cloud? (choose two)

  A. LSP
  B. RSVP
  C. ECMP
  D. LDP
  E. MPLS OAM
  B. RSVP
  D. LDP

• Question 707:

  Refer to the exhibit. An OSPF neighbor relationship between R2 and R3 is showing stuck in EXCHANGE/EXSTART state. The neighbor is established between R1 and R2. The network engineer can ping from R2 to R3 and vice versa, but the neighbor is still down. Which action resolves the issue?

  

  A. Restore the Layer 2/Layer 3 conectivity issue in the ISP network.
  B. Match MTU on both router interfaces or ignore MTU.
  C. Administrative "shut then no shut" both router interfaces.
  D. Enable OSPF on the interface, which is required.
  B. Match MTU on both router interfaces or ignore MTU.

• Question 708:

  Refer lo the exhibit.

  

  The Customer Edge router wants to use AS 100 as the preferred ISP for all external routes and ISP-2 as a backup.

  Customer-Edge

  route-map SETAS set as-path prepend 111 ! router bgp 64555 neighbor 192.168.1.1 remote-as 100 neighbor 192.168.2.2 remote-as 200 neighbor 192.168.2.2 route-map SETAS in

  After this configuration, all the backup routes have disappeared from the BGP table on the Customer Edge router. Which set of configurations resolves the issue on the Customer Edge router?

  A. route-map SETAS set as-path prepend 200 ! router bgp 64555 neighbor 192.168.1.1 remote-as 100 neighbor 192.168.2.2 remote-as 200 neighbor 192.168.2.2 route-map SETAS in
  B. route-map SETAS set as-path prepend 111 ! router bgp 64555 neighbor 192.168.1.1 remote-as 100 neighbor 192.168.2.2 remote-as 200 neighbor 192.168.2.2 route-map SETAS out
  C. route-map SETAS set as-path prepend 200 ! router bgp 64555 neighbor 192.168.1.1 remote-as 100 neighbor 192.168.2.2 remote-as 200 neighbor 192.168.2.2 route-map SETAS out
  D. route-map SETAS set as-path prepend 111 ! router bgp 64555 neighbor 192.168.2.2 remote-as 100 neighbor 192.168.1.1 remote-as 200 neighbor 192.168.1.1 route-map SETAS in
  A. route-map SETAS set as-path prepend 200 ! router bgp 64555 neighbor 192.168.1.1 remote-as 100 neighbor 192.168.2.2 remote-as 200 neighbor 192.168.2.2 route-map SETAS in

• Question 709:

  You need to manually assign IPv6 addresses to the interfaces on an IPv6-enabled router. While assigning addresses, you need to ensure that the addresses participate in neighbor discovery and in stateless auto- configuration process on a physical link. Which of the following addresses can be assigned to the interfaces?

  A. FEC0:0:0:1::1/64
  B. FE80::260:3EFF:FE11:6770/10
  C. 2001:0410:0:1:0:0:0:1/64
  D. 2002:500E:2301:1:20D:BDFF:FE99:F559/64
  B. FE80::260:3EFF:FE11:6770/10

  ---

  The FE80::260:3EFF:FE11:6770/10 address can be assigned to an interface of the IPv6-enabled router. This address is a link-local address as it has the prefix FE80::/10. Link-local addresses can be configured for an interface either automatically or manually.

  Link-local addresses are IPv6 unicast addresses that are configured on the interfaces of an IPv6-enabled router. With link-local addresses, the nodes can connect to a network (local link) and communicate with other nodes. In addition, these addresses participate in the neighbor discovery protocol and the stateless auto- configuration process.

  The FEC0:0:0:1::1/64 address should not be used for the interfaces because this address is a site-local address. Site-local addresses are IPv6 equivalent addresses to IPv4's private address classes. These addresses are available only within a site or an intranet, which typically is made of several network links.

  You should not use the 2001:0410:0:1:0:0:0:1/64 and 2002:500E:2301:1:20D:BDFF:FE99:F559 addresses for the interfaces. These two addresses are global unicast addresses as they fall in the range from 2000::/3 and to E000::/3. A global address is used on links that connect organizations to the Internet service providers (ISPs).

  Objective:

  Layer 3 Technologies

  Sub-Objective:

  Identify IPv6 addressing and subnetting

  References:

  Cisco > Understanding IPv6 Link Local Address

• Question 710:

  What statement about route distinguishes in an MPLS network is true?

  A. Route distinguishes make a unique VPNv4 address across the MPLS network.
  B. Route distinguishers allow multiple instances of a routing table to coexist within the edge router.
  C. Route distinguishes are used for label bindings
  D. Route distinguishes define which prefixes are imported and exported on the edge router
  A. Route distinguishes make a unique VPNv4 address across the MPLS network.