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Q551. How does EIGRP derive the metric for manual summary routes? 

A. It uses the best composite metric of any component route in the topology table. 

B. It uses the worst composite metric of any component route in the topology table. 

C. It uses the best metric vectors of all component routes in the topology table. 

D. It uses the worst metric vectors of all component routes in the topology table. 

Answer: A 

Explanation: 

For example if your router has a routing table like this: 

D 192.168.8.0/24 [90/2632528] via 192.168.0.1, 00:00:12, Serial0/0 

D 192.168.9.0/24 [90/2323456] via 192.168.0.1, 00:00:12, Serial0/0 

D 192.168.10.0/24 [90/2195456] via 192.168.0.1, 00:00:12, Serial0/0 

D 192.168.11.0/24 [90/2323456] via 192.168.0.1, 00:00:12, Serial0/0 

Now suppose you want to manually summarize all the routes above, you can use this command (on the router that advertised these routes to our router): 

Router(config-if)#ip summary-address eigrp 1 192.168.8.0 255.255.248.0 

After that the routing table of your router will look like this: 

D 192.168.8.0/21 [90/2195456] via 192.168.0.1, 00:01:42, Serial0/0 

And we can see the manual summary route takes the smallest metric of the specific routes. 


Q552. Which two statements about the BGP community attribute are true? (Choose two.) 

A. Routers send the community attribute to all BGP neighbors automatically. 

B. A router can change a received community attribute before advertising it to peers. 

C. It is a well-known, discretionary BGP attribute. 

D. It is an optional transitive BGP attribute. 

E. A prefix can support only one community attribute. 

Answer: B,D 

Explanation: 

A community is a group of prefixes that share some common property and can be configured with the BGP community attribute. The BGP Community attribute is an optional transitive attribute of variable length. The attribute consists of a set of four octet values that specify a community. The community attribute values are encoded with an Autonomous System (AS) number in the first two octets, with the remaining two octets defined by the AS. A prefix can have more than one community attribute. A BGP speaker that sees multiple community attributes in a prefix can act based on one, some or all the attributes. A router has the option to add or modify a community attribute before the router passes the attribute on to other peers. 

Reference: 

http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/28784-bgp-community.html 


Q553. Refer to the exhibit. 

All switches have default bridge priorities, and originate BPDUs with MAC addresses as indicated. The numbers shown are STP link metrics. Which two ports are forwarding traffic after STP converges? (Choose two.) 

A. The port connecting switch SWD with switch SWE 

B. The port connecting switch SWG with switch SWF 

C. The port connecting switch SWC with switch SWE 

D. The port connecting switch SWB with switch SWC 

Answer: C,D 

Explanation: 

Here, we know SWB to SWC are forwarding because we already identified the blocking port. So for the last correct answer let’s consider what must be done to prevent a switch loop between SWC/SWD/SWE. SWE to SWD will be blocked because SWC has a lower MAC address so it wins the forwarding port. And to look at it further, you could try to further understand what would happen with ports on SWG. Would the ports on SWG try to go through SWE or SWF? SWE has the lower MAC address so the port from SWG to SWE would win the forwarding election. Therefore, answer B could never be correct. 


Q554. What is the most common use for route tagging in EIGRP? 

A. to determine the route source for management purposes 

B. to change the metric of a prefix 

C. to filter routes in order to prevent routing loops 

D. to modify path selection for certain classes of traffic 

Answer: C 


Q555. Which statement about OSPF loop prevention is true? 

A. The discard route is generated automatically on the ABR to prevent routing loops. 

B. The ASBR uses type 3 LSAs from non-backbone areas to prevent control-plane routing loops. 

C. The ABR can filter type 3 LSPs to prevent routing loops. 

D. The DN bit ignores LSA types 2, 3, and 5 to prevent routing loops. 

Answer: A 


Regenerate cisco 400-101:

Q556. A network engineer wants to add a new switch to an existing switch stack. Which configuration must be added to the new switch before it can be added to the switch stack? 

A. No configuration must be added. 

B. stack ID 

C. IP address 

D. VLAN information 

E. VTP information 

Answer: A 


Q557. Which map is locally defined? 

A. DSCP-to-DSCP-mutation 

B. CoS-to-DSCP 

C. IP-precedence-to-DSCP 

D. DSCP-to-CoS 

Answer: A 


Q558. Refer to the exhibit. 

This network is configured with PIM, and the RPF check has failed toward the multicast source. Which two configuration changes must you make to router R3 to enable the RPF check to pass? (Choose two.) 

A. Configure a static multicast route to the multicast source through the tunnel interface. 

B. Configure a static multicast route to the multicast source LAN through the tunnel interface. 

C. Configure a static multicast route to the multicast source LAN through the Ethernet interface. 

D. Remove the command ip prim bidir-enable from the R3 configuration. 

Answer: A,B 


Q559. What are the minimal configuration steps that are required to configure EIGRP HMAC-SHA2 authentication? 

A. classic router mode, interface XX, authentication mode hmac-sha-256 <password> 

B. named router mode, address-family statement, authentication mode hmac-sha-256 <password> 

C. named router mode, address-family statement, af-interface default, authentication mode hmac-sha-256 <password> 

D. named router mode, address-family statement, authentication mode hmac-sha-256 <password> 

Answer: C 

Explanation: 

The example below shows how to configure EIGRP HMAC-SHA2 on Cisco router: 

Device(config)# router eigrp name1 

Device(config-router)# address-family ipv4 autonomous-system 45000 

Device(config-router-af)# af-interface ethernet 0/0 

Device(config-router-af-interface)# authentication mode hmac-sha-256 0 password1 

Device(config-router-af-interface)# end 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/configuration/15-sy/ire-15-sy-book/ire-sha-256.html 


Q560. 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 

Explanation: 

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: 

–PAGP 

–LACP 

–UDLD 

–LLDP 

–CDP 

–MSTP 

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SY/configuration/guide/sy_swcg/ethernet_virtual_connection.html