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Q281. Which two statements about MAC ACLs are true? (Choose two.) 

A. They support only inbound filtering. 

B. They support both inbound and outbound filtering. 

C. They are configured with the command mac access-list standard. 

D. They can filter non-IP traffic on a VLAN and on a physical interface. 

Answer: A,D 

Explanation: 

MAC ACL, also known as Ethernet ACL, can filter non-IP traffic on a VLAN and on a physical Layer 2 interface by using MAC addresses in a named MAC extended ACL. The steps to configure a MAC ACL are similar to those of extended named ACLs. MAC ACL supports only inbound traffic filtering. 

Reference: http://www.ciscopress.com/articles/article.asp?p=1181682&seqNum=4 


Q282. Which IPv6 tunneling type establishes a permanent link between IPv6 domains over IPv4? 

A. IPv4-compatible tunneling 

B. ISATAP tunneling 

C. 6to4 tunneling 

D. manual tunneling 

Answer: D 

Explanation: 

A manually configured tunnel is equivalent to a permanent link between two IPv6 domains over an IPv4 backbone. The primary use is for stable connections that require regular secure communication between two edge routers or between an end system and an edge router, or for connection to remote IPv6 networks. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/ipv6/configuration/guide/12_4t/ipv6_12_4t_book/i p6-tunnel.html 


Q283. A floating static route appears in the routing table of an interface even when the interface is unusable. 

Which action can you take to correct the problem? 

A. Remove the permanent option from the static route. 

B. Correct the administrative distance. 

C. Configure the floating static route to point to another route in the routing table. 

D. Correct the DHCP-provided route on the DHCP server. 

Answer: A 


Q284. 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 in blocking state after STP converges? (Choose two.) 

A. the port on switch SWD that connects to switch SWE 

B. the port on switch SWF that connects to switch SWG 

C. the port on switch SWD that connects to switch SWC 

D. the port on switch SWB that connects to switch SWD 

Answer: C,D 

Explanation: 

This is a scenario that wants you to demonstrate understanding of the Root switch and Root port election process. So, it’s best to start with where the root switch will be and work down from there. It’s setup nicely because the lowest MAC address switch starts at the top and then the lower priority/higher mac addresses move down the architecture. SWA wins the root election and of course all ports in SWA are forwarding. SWB introduces the possibility for a switching loop so it’s important to understand which ports will be put into the blocking state. Since SWD is a higher MAC address it will end up with a blocked port connected to SWB to prevent a loop: and this is one of the correct answers. To prevent the possibility of another potential switching loop, SWD again ends up with the higher MAC address so blocking the link between D and C prevents a B/C/D switching loop. 


Q285. Which two functions are performed by the DR in OSPF? (Choose two.) 

A. The DR originates the network LSA on behalf of the network. 

B. The DR is responsible for the flooding throughout one OSPF area. 

C. The DR forms adjacencies with all other OSPF routers on the network, in order to synchronize the LSDB across the adjacencies. 

D. The DR is responsible for originating the type 4 LSAs into one area. 

Answer: A,C 

Explanation: 

The DR originates the network LSA (LSA Type 2) which lists all the routers on the segment it is adjacent to -> A is correct. Types 2 are ooded within its area only; does not cross ABR -> B is incorrect. The broadcast and non-broadcast network types elect a DR/BDR. They form adjacencies to all other OSPF routers on the network and help synchronize the Link State Database (LSDB) across the adjacencies -> C is correct. LSAs Type 4 are originated by the ABR to describe an ASBR to routers in other areas so that routers in other areas know how to get to external routes through that ASBR -> D is incorrect. 


Up to date 400-101 braindumps:

Q286. Which two values are needed to configure NTP authentication? (Choose two.) 

A. the encryption method 

B. the key number 

C. the burst mode 

D. the key string 

E. the Diffie-Hellman group 

Answer: B,D 


Q287. Which two statements about a network running MPLS VPN with IS-IS IGP are true? (Choose two.) 

A. IS-IS traffic engineering uses wide metric TLV type 135 with an up/down bit to define a leaked route. 

B. IS-IS traffic engineering uses wide metric TLV type 128 with an internal/external bit and an up/down bit to define a leaked route. 

C. IS-IS traffic engineering uses wide metric TLV type 130 with an internal/external bit and an up/down bit to define a leaked route. 

D. If the IS-IS up/down bit is set to 1, the leaked route originated in the L1 area. 

E. The MPLS VPN IS-IS core is inherently protected against IP-based attacks. 

Answer: A,E 


Q288. How does MSTP provide backward compatibility with RSTP? 

A. It uses the hop count variable as a TTL counter. 

B. It transmits all spanning-tree information in one BPDU. 

C. It supports up to 128 MSTI messages. 

D. It encodes the MSTP-specific region information before the legacy RSTP BPDU. 

Answer: D 


Q289. On a broadcast interface, which two OSPF states support BFD sessions? (Choose two.) 

A. DR 

B. BDR 

C. DROTHER 

D. 2WAY 

E. FULL 

F. ACTIVE 

Answer: A,B 


Q290. Refer to the exhibit. 

NHRP registration is failing; what might be the problem? 

A. invalid IP addressing 

B. fragmentation 

C. incorrect NHRP mapping 

D. incorrect NHRP authentication 

Answer: D 

Explanation: 

Configuring an authentication string ensures that only routers configured with the same string can communicate using NHRP. Therefore, if the authentication scheme is to be used, the same string must be configured in all devices configured for NHRP on a fabric 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_4/ip_addr/configuration/guide/hadnhrp.html#w p1055432