Correct Answers :

[B]

Explanation :

The term TCP Maximum Segment Size (MSS) seems to imply the size of the entire Layer 4 segment (that is, including Layer 2, Layer 3, and Layer 4 headers). However, TCP MSS only refers to the amount of data in the segment (without the inclusion of any headers).

Correct Answers :

[A and D]

Explanation :

A nonbroadcast multiaccess (NBMA) network can have Split Horizon issues in a hub-and-spoke topology, because a route learned by the hub router from a spoke router might not be advertised back out to any other spoke routers, because of Split Horizon operation. Also, if the NBMA network is using OSPF, there can be designated router issues, because the spoke routers might not be able to communicate with one another through broadcasts.

Correct Answers :

[B and E]

Explanation :

Packets created by Telnet use TCP, so the packets will match ACL 101 with a permit action. PBR will match the only route map clause shown in the configuration, with the permit route map clause listing a set command. The set command lists S0/0/1 as the outgoing interface and without a default parameter. So, Router R1 will first attempt to forward the packet based on the set command (interface S0/0/1), but if the interface is down, R1 will then try to forward based on the IP routing table (interface S0/1/1).

Correct Answers :

[D]

Explanation :

The output from the show ip policy command shows the interfaces on which PBR has been enabled and the name of the route map enabled for PBR on each interface. For the purposes of this question, the output tells us the interfaces on which PBR has been enabled. Two answers mention packets exiting the interface. Therefore, these answers cannot be correct, because PBR applies to packets entering an interface. For the two interfaces that mention inbound packets, one suggests that all packets will be forwarded per the PBR configuration; some might not be forwarded per PBR, depending on the configuration of the route map. The correct answer specifically mentions that PBR will consider all packets with PBR, which is the more accurate statement about PBR operations.

Correct Answers :

[A]

Explanation :

In a Layer 3 MPLS VPN, a customer edge (CE) router forms a neighborship with a provider edge (PE) router (or an edge label switch router [ELSR]) in an MPLS network. In a Layer 2 MPLS VPN, the MPLS network acts as a Layer 2 switch. IP multicast traffic can flow across an MPLS network with no issue.

Correct Answers :

[C]

Explanation :

The three lines shown create the operation number (first command), define the operation (second command), and start the operation (third command). All commands are correct. After the operation is started, IP SLA stores the data in the RTTMON MIB; no additional configuration is necessary.

Correct Answers :

[D]

Explanation :

The up timer on the tracking object defines how long to wait, when in a down state, after seeing the IP SLA object transition to an OK state. Similarly, the down timer defines how long to wait, when in an OK state, after seeing the IP SLA object move to a down state, before moving the tracking object to a down state.

Correct Answers :

[C]

Explanation :

A hybrid VPN uses more than one VPN technology. While you can encrypt a packet that has already been encapsulated by a VPN technology, and while you can encapsulate a packet that has already been encrypted, you might need to decrease the MTU for a frame on an interface configured for tunneling. The reason for the MTU decrease is that additional header information is added for each VPN technology you use. As a result, the maximum amount of data contained in a frame is reduced.

Correct Answers :

[A,B and D]

Explanation :

RIP-2 and RIPng both use UDP, both use Distance Vector logic, and both use the same metric, with the same maximum (15) and same metric that means infinity (16). RIPng does not perform automatic route summarization because IPv6 has no concept of a classful network. RIPng also uses the built-in IPv6 authentication mechanisms, rather than a RIP-specific authentication such as RIP-2.

Correct Answers :

[D]

Explanation :

Because the question states that no IPv4 configuration exists, EIGRP for IPv6 cannot derive a 32-bit EIGRP router ID. Before EIGRP will work, R1 needs to define an EIGRP router ID (using the eigrp router-id command) and enable EIGRP using the no shutdown router subcommand.

Correct Answers :

[B]

Explanation :

EIGRP uses the link local address as the next hop for routing protocols. Based on R2’s MAC address, R2’s link local address on F0/0 will be FE80::1311:11FF:FE11:1111. This value is derived by splitting the MAC, inserting FFFE, and flipping bit 7, making the initial hex 11 become hex 13.

Correct Answers :

[A and C]

Explanation :

OSPFv3 supports multiple OSPF instances per interface, whereas OSPFv2 does not. Also, each version requires a different set of requirements be met before becoming neighbors, most notably that OSPFv3 does not require neighboring OSPFv3 routers to be in the same subnet.

Correct Answers :

[C]

Explanation :

Because the question states that no IPv4 configuration exists, OSPFv3 cannot derive a 32-bit OSPF router ID. Before OSPFv3 works, R1 needs to define an OSPF router ID (using the OSPF router-id command).

Correct Answers :

[A]

Explanation :

The redistribute command does not have a subnets option for IPv6 because OSPFv3 has no concept of IPv6 classful networks nor their subnets. As configured, the redistribute command redistributes only EIGRP-learned routes. If the includeconnected parameter had been included, the connected route for 2000:0:0:1::/64 would have also been redistributed. Local routes are never redistributed.

Correct Answers :

[B]

Explanation :

The only configurable item after the interface that does not first list a keyword is the administrative distance parameter.

Correct Answers :

[B]

Explanation :

A manually configured tunnel explicitly defines the destination IPv4 address, as does a GRE IPv6 tunnel. The other two types listed in the answer do not. Additionally, a manually configured tunnel uses mode ipv6ip, whereas GRE tunnels use mode gre.

Correct Answers :

[C]

Explanation :

IOS defaults to use GRE encapsulation mode on tunnel interfaces, so the tunnel mode command is not required. The mode will default to GRE. The tunnel source and tunnel destination commands are required.

Correct Answers :

[A]

Explanation :

An automatic 6to4 tunnel does not use a tunnel destination command on the tunnel interface; ISATAP tunnels also do not use this command. However, automatic 6to4 tunnels use IPv6 addresses that begin 2002::/16 and have the tunnel’s source IPv4 address imbedded as the second and third octets of the IPv6 address, whereas ISATAP tunnels do not. Because C0A5:101 hex equals 192.168.1.1 in dotted decimal, this configuration represents the almost completed configuration for an automatic 6to4 tunnel.

Correct Answers :

[A and D]

Explanation :

ISATAP uses a modified EUI-64 format, which adds the IPv4 address, in hex, into quartets 7 and 8. Automatic 6to4 tunnels use address range 2002::/16, with the next two quartets (second and third quartets) used to store the hex version of an IPv4 address.

Correct Answers :

[D]

Explanation :

The combination of the configured eui-64 parameter on the ipv6 address command, and the tunnel mode of isatap, tells the router to use modified EUI-64 rules. These rules start with the configured 64 bit prefix (2000::/64 in this case), adding 0000:5EFE as the fifth and sixth quartets. The last two quartets are taken from the tunnel source command’s referenced IPv4 address. In this case, 192.168.1.1 converts to C0A8:0101, making the last answer correct.