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Q231. In which two modes do IPv6-in-IPv4 tunnels operate? (Choose two.) 

A. tunnel mode 

B. transport mode 

C. 6to4 mode 

D. 4to6 mode 

E. ISATAP mode 

Answer: C,E 


*There are 5 tunneling solution in IPv6:* 

*1. Using the “Tunnel mode ipv6ip”, in this case the tunnel source and destination are configured with IPv4 addressing and the tunnel interface is configured with IPv6. This will use protocol 41. This is used for IPv6/IPv4. 

R1(config)#int tunnel 1 

R1(config-if)#ipv6 address 12:1:12::1/64 

R1(config-if)#tunnel source 

R1(config-if)#tunnel destination 

R1(config-if)#*tunnel mode ipv6ip* 


2. Using the “Tunnel mode gre ipv6, in this case the tunnel source and destination are all configured with IPv6 addressing. This is used for IPv6/IPv6. 

BB1(config)#int tunnel 1 

BB1(config-if)#ipv6 address 121:1:121::111/64 

BB1(config-if)#tunnel source 10:1:111::111 

BB1(config-if)#tunnel destination 10:1:112::112 

BB1(config-if)#*tunnel mode gre ipv6* 


In this case, the third type, the tunnel mode is NOT used at all, note that the tunnel interface is configured with IPv6 and the tunnel source and destination is configured with IPv4 but no mention of tunnel mode. This configuration will use protocol 47. This is used for IPv6/IPv4. 

R1(config)#int tunnel 13 

R1(config-if)#ipv6 address 13:1:13::1/64 

R1(config-if)#tunnel source 

R1(config-if)#tunnel destination 

*4. Note in this case a special addressing is assigned to the tunnel interface which is a concatenation of a reserved IPv6 address of 2002followed by the translated IPv4 address of a given interface on the router. In this configuration ONLY the tunnel source address is used and since the tunnel is automatic, the destination address is NOT configured. The tunnel mode is set to “Tunnel mode ipv6ip 6to4. Note the IPv4 address of is translated to 0A.01.01.01 and once concatenated, it will be “2002:0A01:0101: or 2002:A01:101. This is used for IPv6/IPv4. 

R1(config)#interface Tunnel14 

R1(config-if)#ipv6 address 2002:A01:101::/128 

R1(config-if)#tunnel source 

R1(config-if)#*tunnel mode ipv6ip 6to4* 

*5. ISATAP, ISATAP works like 6to4 tunnels, with one major difference, it uses a special IPv6 address which is formed as follows: * 

*In this tunnel mode, the network portion can be any IPv6 address, whereas in 6to4 it had to start with 2002.* 

*Note when the IPv6 address is assigned to the tunnel interface, the “eui-64 is used, in this case the host portion of the IPv6 address starts with “0000.5EFE” and then the rest of the host portion is the translated IPv4 address of the tunnel’s source IPv4 address. This translation is performed automatically unlike 6to4. This is used for IPv6/IPv4.* 

R4(config)#int tunnel 46 

R4(config-if)#ipv6 address 46:1:46::/64 eui-64 

R4(config-if)#tunnel source 

R4(config-if)#*tunnel mode ipv6ip ISATAP* 

Q232. Refer to the exhibit. 

When the link between RtrB and RtrC goes down, multicast receivers stop receiving traffic from the source for multicast group solution will resolve this? 

A. adding a static mroute on RtrB and RtrF 

B. adding a static unicast route on RtrB and RtrF 

C. creating a GRE tunnel between RtrB and RtrD 

D. enabling PIM sparse mode on both ends of the link between RtrB and RtrF 



For multicast traffic to flow, PIM must be enabled on all routers in the path of the multicast stream. 

Q233. Which EIGRP packet types are sent as unicast packets? 

A. hello, update, query 

B. query, SIA query, reply 

C. SIA query, reply, ACK 

D. query, SIA query, SIA reply 


Q234. Which variable in an EEM applet is set when you use the sync yes option? 

A. $_cli_result 

B. $_result 

C. $_string_result 

D. $_exit_status 



The CLI event detector screens CLI commands for a regular expression match. When a match is found, an event is published. The match logic is performed on the fully expanded CLI command after the command is successfully parsed and before it is executed. The CLI event detector supports three publish modes: 

. Synchronous publishing of CLI events–The CLI command is not executed until the EEM policy exits, and the EEM policy can control whether the command is executed. The read/write variable, _exit_status, allows you to set the exit status at policy exit for policies triggered from synchronous events. If _exit_status is 0, the command is skipped, if _exit_status is 1, the command is run. 

. Asynchronous publishing of CLI events–The CLI event is published, and then the CLI command is executed. 

. Asynchronous publishing of CLI events with command skipping–The CLI event is published, but the CLI command is not executed. 



Q235. In a PfR environment, which two statements best describe the difference between active mode monitoring and fast mode monitoring? (Choose two.) 

A. Active mode monitoring can monitor and measure actual traffic via NetFlow data collection. 

B. Fast mode monitoring can measure bursty traffic better than active mode. 

C. Active mode monitoring uses IP SLA probes for the purpose of obtaining performance characteristics of the current WAN exit link. 

D. Fast mode monitoring uses IP SLA probes via all valid exits continuously to quickly determine an alternate exit link. 

Answer: C,D 


Active Monitoring 

PfR uses Cisco IOS IP Service Level Agreements (SLAs) to enable active monitoring. IP SLAs support is enabled by default. IP SLAs support allows PfR to be configured to send active probes to target IP addresses to measure the jitter and delay, determining if a prefix is out-of-policy and if the best exit is selected. The border router collects these performance statistics from the active probe and transmits this information to the master controller. 

Fast Failover Monitoring 

Fast failover monitoring enables passive and active monitoring and sets the active probes to continuously monitor all the exits (probe-all). Fast failover monitoring can be used with all types of active probes: Internet Control Message Protocol (ICMP) echo, jitter, TCP connection, and UDP echo. 



Drag each IPv6 extension header on the left to its corresponding description on the right. 


Q237. Which IPv6 tunneling mechanism requires a service provider to use one of its own native IPv6 blocks to guarantee that its IPv6 hosts will be reachable? 

A. 6rd tunneling 

B. automatic 6to4 tunneling 

C. NAT-PT tunneling 

D. ISATAP tunneling 

E. manual ipv6ip tunneling 

F. automatic 4to6 tunneling 


Q238. Two routers are trying to establish an OSPFv3 adjacency over an Ethernet link, but the adjacency is not forming. Which two options are possible reasons that prevent OSPFv3 to form between these two routers? (Choose two.) 

A. mismatch of subnet masks 

B. mismatch of network types 

C. mismatch of authentication types 

D. mismatch of instance IDs 

E. mismatch of area types 

Answer: D,E 


An OSPFv3 interface must have a compatible configuration with a remote interface before the two can be considered neighbors. The two OSPFv3 interfaces must match the following criteria: 

. Hello interval 

. Dead interval 

. Area ID 

. Optional capabilities 

The OSPFv3 header includes an instance ID field to identify that OSPFv3 packet for a particular OSPFv3 instance. You can assign the OSPFv3 instance. The interface drops all OSPFv3 packets that do not have a matching OSPFv3 instance ID in the packet header. 


Q239. Refer to the exhibit. 

Which part of the joined group addresses list indicates that the interface has joined the EIGRP multicast group address? 

A. FF02::1 

B. FF02::1:FF00:200 

C. FF02::A 

D. FF02::2 



FF02::A is an IPv6 link-local scope multicast addresses. This address is for all devices on a wire that want to "talk" EIGRP with one another. 

Focusing specifically on FF02::A and how routers join it, we can see and say three things: 

. Local: FF02::A is local to the wire. 

. Join: Each device "joins" FF02::A by just "deciding to listen" to the IPv6 link-local scope multicast address FF02::A. Then, by extension, it listens to the corresponding MAC address for that multicast IPv6 address (33:33:00:00:00:0A). 

. Common interest: As we can see, these varying groups have something in common that they would all like to hear about. For FF02::A, the common interest –the "connection" among the devices joining that group – is that they all want to listen to or participate in EIGRP. 


Q240. Which three statements about EVCs are true? (Choose three.) 

A. Spanning Tree must use MST mode on EVC ports. 

B. PAGP is supported on EVC ports. 

C. Spanning Tree must use RSTP mode on EVC ports. 

D. LACP is supported on EVC ports. 

E. Layer 2 multicast framing is supported. 

F. Bridge domain routing is required. 

Answer: A,B,D 


EVC support requires the following: 

–The spanning tree mode must be MST. 

–The dot1ad global configuration mode command must be configured. 

These Layer 2 port-based features can run with EVC configured on a port: