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Q31. Which statement about VRRP is true? 

A. It supports load balancing. 

B. It can be configured with HSRP on a switch or switch stack. 

C. It supports IPv4 and IPv6. 

D. It supports encrypted authentication. 

Answer: B 

Explanation: 

VRRP Limitations 

. You can configure both HSRP and VRRP on a switch or switch stack. However, you cannot add a switch model that supports only one protocol to a stack that is configured for both protocols. 

. The VRRP implementation on the switch does not support the MIB specified in RFC 2787. 

. The VRRP implementation on the switch supports only text -based authentication. 

. The switch supports VRRP only for IPv4. 

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/1 2-2_58_se/configuration/guide/3750xscg/swhsrp.html#pgfId-1107127 


Q32. What are the three variants of NTPv4? (Choose three.) 

A. client/server 

B. broadcast 

C. symmetric 

D. multicast 

E. asymmetric 

F. unicast 

Answer: A,B,C 


Q33. Refer to the exhibit. 

Which two corrective actions could you take if EIGRP routes from R2 fail to reach R1? (Choose two.) 

A. Configure R2 to use a VRF to send routes to R1. 

B. Configure the autonomous system in the EIGRP configuration of R1. 

C. Correct the network statement on R2. 

D. Add the interface on R1 that is connected to R2 into a VRF. 

Answer: B,D 

Explanation: 

In this question we are running VRF Lite on R1. VRF Lite is also knows as “VRF without 

running MPLS”. This is an example of how to configure VRF Lite with EIGRP: 

ip vrf FIRST 

rd 1:1 

! 

ip vrf SECOND 

rd 1:2 

! 

router eigrp 1 

no auto-summary 

! 

address-family ipv4 vrf FIRST 

network 10.1.1.1 0.0.0.0 

no auto-summary 

autonomous-system 200 

exit-address-family 

! 

address-family ipv4 vrf SECOND 

network 10.1.2.1 0.0.0.0 

no auto-summary 

autonomous-system 100 

exit-address-family 

! 

interface FastEthernet0/0 

ip vrf forwarding FIRST 

ip address 10.1.1.1 255.255.255.0 

! 

interface FastEthernet0/1 

ip vrf forwarding SECOND 

ip address 10.1.2.1 255.255.255.0 

The above example creates two VRFs (named “FIRST” and “SECOND”). VRF “FIRST” runs on EIGRP AS 200 while VRF “SECOND” runs on EIGRP AS 100. After that we have to add interfaces to the appropriate VRFs. From this example, back to our question we can see that R1 is missing the “autonomous-system …” command under “address-family ipv4 vrf R2. And R1 needs an interface configured under that VRF. 

Note. R2 does not run VRF at all! Usually R2 resides on customer side. 


Q34. When you enable the MPLS Multi-VRF feature, which two supported routing protocols can be used to exchange routing information between PE routers and CE routers? (Choose two.) 

A. BGP 

B. RIP 

C. OSPF 

D. EIGRP 

E. IS-IS 

Answer: A,B 


Q35. Which protocol is the encapsulating protocol for mtrace packets? 

A. ICMP 

B. IGMP 

C. PIM 

D. GRE 

Answer: B 

Explanation: 

“mtrace” is a diagnostic tool to trace the multicast path from a specified source to a destination for a multicast group. It runs over IGMP protocol. Mtrace uses any information available to it to determine a previous hop to forward the trace towards the source. 

Reference: http://www.brocade.com/downloads/documents/html_product_manuals/NI_05500c_MULTI CAST/wwhelp/wwhimpl/common/html/wwhelp.htm#context=NI_MCAST&file=IP_Multicast. 3.04.html 


Renovate 400-101 test question:

Q36. Which statement describes Cisco PfR link groups? 

A. Link groups enable Cisco PfR Fast Reroute when NetFlow is enabled on the external interfaces of the border routers. 

B. Link groups define a strict or loose hop-by-hop path pReference: 

C. Link groups are required only when Cisco PfR is configured to load-balance all traffic. 

D. Link groups are enabled automatically when Cisco PfR is in Fast Reroute mode. 

E. Link groups set a preference for primary and fallback (backup) external exit interfaces. 

Answer: E 

Explanation: 

The Performance Routing - Link Groups feature introduced the ability to define a group of exit links as a preferred set of links, or a fallback set of links for PfR to use when optimizing traffic classes specified in an PfR policy. PfR currently selects the best link for a traffic class based on the preferences specified in a policy and the traffic class performance—using parameters such as reachability, delay, loss, jitter or MOS—on a path out of the specified link. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/pfr/configuration/guide/15_1/pfr_15_1_book/pfr-link-group.html 


Q37. Which two options are ways in which an OSPFv3 router handles hello packets with a clear address-family bit? (Choose two.) 

A. IPv4 unicast packets are discarded. 

B. IPv6 unicast packets are discarded. 

C. IPv4 unicast packets are forwarded. 

D. IPv6 unicast packets are forwarded. 

Answer: A,D 

Explanation: 

A typical distance vector protocol saves the following information when computing the best path to a destination: the distance (total metric or distance, such as hop count) and the vector (the next hop). For instance, all the routers in the network in Figure 1 are running Routing Information Protocol (RIP). Router Two chooses the path to Network A by examining the hop count through each available path. 

Since the path through Router Three is three hops, and the path through Router One is two hops, Router Two chooses the path through One and discards the information it learned through Three. If the path between Router One and Network A goes down, Router Two loses all connectivity with this destination until it times out the route of its routing table (three update periods, or 90 seconds), and Router Three re-advertises the route (which occurs every 30 seconds in RIP). Not including any hold-down time, it will take between 90 and 120 seconds for Router Two to switch the path from Router One to Router Three. EIGRP, instead of counting on full periodic updates to re-converge, builds a topology table from each of its neighbor's advertisements (rather than discarding the data), and converges by either looking for a likely loop-free route in the topology table, or, if it knows of no other route, by querying its neighbors. Router Two saves the information it received from both Routers One and Three. It chooses the path through One as its best path (the successor) and the path through Three as a loop-free path (a feasible successor). When the path through Router One becomes unavailable, Router Two examines its topology table and, finding a feasible successor, begins using the path through Three immediately. 

Reference: http://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routing-protocol-eigrp/16406-eigrp-toc.html 


Q38. Refer to the exhibit. 

Which statement is true? 

A. The Cisco PfR state is UP; however, the external interface Et0/1 of border router 10.1.1.1 has exceeded the maximum available bandwidth threshold. 

B. The Cisco PfR state is UP; however, an issue is preventing the border router from establishing a TCP session to the master controller. 

C. The Cisco PfR state is UP and is able to monitor traffic flows; however, MD5 authentication has not been successful between the master controller and the border routers. 

D. The Cisco PfR State is UP; however, the receive capacity was not configured for inbound traffic. 

E. The Cisco PfR state is UP, and the link utilization out-of-policy threshold is set to 90 percent for traffic exiting the external links. 

Answer: E 

Explanation: 

All three interfaces show as UP, and the capacity is set to 500 kbps, with the max threshold set to 450 kbps (90% of 500kbps). 


Q39. Refer to the exhibit. 

Which prefixes will appear in the EIGRP topology table? 

A. 10.0.0.0/8, 172.16.1.0/24, 192.168.0.0/16 

B. 10.1.1.0/24, 10.1.2.0/24, 172.16.1.0/26, 192.168.1.0/26, 192.168.2.0/26 

C. 10.1.1.0/24, 10.1.2.0/24, 172.16.1.0/26, 172.16.2.0/26, 192.168.1.0/26, 192.168.2.0/26 

D. 10.1.1.1/24, 10.1.2.1/24, 172.16.1.1/26, 172, 192.168.1.1/26, 192.168.2.1/26 

Answer: B 


Q40. Which term describes an EIGRP route that has feasible successors? 

A. active 

B. passive 

C. redistributed 

D. invalid 

Answer: B 

Explanation: 

A topology table entry for a destination can have one of two states. A route is considered in the Passive state when a router is not performing a route recomputation. The route is in Active state when a router is undergoing a route recomputation. If there are always feasible successors, a route never has to go into Active state and avoids a route recomputation. 

When there are no feasible successors, a route goes into Active state and a route recomputation occurs. A route recomputation commences with a router sending a query packet to all neighbors. Neighboring routers can either reply if they have feasible successors for the destination or optionally return a query indicating that they are performing a route recomputation. While in Active state, a router cannot change the next-hop neighbor it is using to forward packets. Once all replies are received for a given query, the destination can transition to Passive state and a new successor can be selected. 

Reference: http://docwiki.cisco.com/wiki/Enhanced_Interior_Gateway_Routing_Protocol