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Q271. Refer to the exhibit. 

While reviewing a log file on a router with this NTP configuration, you note that the log entries of the router display a different time than the NTP time. 

Which action can you take to correct the problem? 

A. Add the localtime keyword to the service timestamps log datetime statement. 

B. Add the msec keyword to the service timestamps log datetime statement. 

C. Add the statement ntp broadcast to the NTP configuration of the neighboring router. 

D. Configure the router to be the NTP master. 

E. Remove the datetime keyword from the service timestamps log datetime statement. 

Answer:


Q272. Which type of port would have root guard enabled on it? 

A. A root port 

B. An alternate port 

C. A blocked port 

D. A designated port 

Answer:

Explanation: 

The root guard feature provides a way to enforce the root bridge placement in the network. The root guard ensures that the port on which root guard is enabled is the designated port. Normally, root bridge ports are all designated ports, unless two or more ports of the root bridge are connected together. If the bridge receives superior STP Bridge Protocol Data Units (BPDUs) on a root guard-enabled port, root guard moves this port to a root-inconsistent STP state. This root-inconsistent state is effectively equal to a listening state. No traffic is forwarded across this port. In this way, the root guard enforces the position of the root bridge. 

Reference: http://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/10588-74.html 


Q273. Which option is true about output policing for the control plane? 

A. It improves router performance by limiting traffic sent to the control plane. 

B. It improves router performance by limiting traffic sent from the control plane. 

C. It improves router performance by limiting traffic sent to and from the control plane. 

D. It controls traffic originated from the router. 

Answer:


Q274. 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. 


Q275. 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 


Q276. In an STP domain, which two statements are true for a nonroot switch, when it receives a configuration BPDU from the root bridge with the TC bit set? (Choose two.) 

A. It sets the MAC table aging time to max_age + forward_delay time. 

B. It sets the MAC table aging time to forward_delay time. 

C. It recalculates the STP topology upon receiving topology change notification from the root switch. 

D. It receives the topology change BPDU on both forwarding and blocking ports. 

Answer: B,D 

Explanation: 

When the TC bit is received, every bridge is then notified and reduces the aging time to forward_delay (15 seconds by default) for a certain period of time (max_age + forward_delay). It is more beneficial to reduce the aging time instead of clearing the table because currently active hosts, that effectively transmit traffic, are not cleared from the table. Once the root is aware that there has been a topology change event in the network, it starts to send out its configuration BPDUs with the topology change (TC) bit set. These BPDUs are relayed by every bridge in the network with this bit set. As a result all bridges become aware of the topology change situation and it can reduce its aging time to forward_delay. Bridges receive topology change BPDUs on both forwarding and blocking ports. An important point to consider here is that a TCN does not start a STP recalculation. This fear comes from the fact that TCNs are often associated with unstable STP environments; TCNs are a consequence of this, not a cause. The TCN only has an impact on the aging time. It does not change the topology nor create a loop. 

Reference: http://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/12013-17.html#topic1 


Q277. 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 


Q278. Refer to the exhibit. 

Why is the loopback 0 interface of R4 missing in the routing table of R2? 

A. R2 is configured as a route reflector client. 

B. There is no peering between R2 and R3. 

C. The next hop is not reachable from R2. 

D. The route originated within the same AS. 

Answer:

Explanation: 

In the “show ip bgp” output we see that there is no peering session between R2 and R3. Since R3 is the route reflector here, R3 would reflect routes advertised from R4 to R2, but the peer needs to be established first. 


Q279. Refer to the exhibit. 

If a connection failure occurs between R1 and R2, which two actions can you take to allow CR-1 to reach the subnet 192.168.192.0/24 on R2? (Choose two.) 

A. Create a static route on R1 for subnet 192.168.192.0/24 towards R3 and redistribute it into OSPF. 

B. Turn up a BGP session between CR-1 and R1. 

C. Create a static route on R1 for subnet 192.168.192.0/24 towards R3 and redistribute it into BGP. 

D. Turn up an EIGRP session between R1 and R3 with AS 65535. 

E. Create an OSPF virtual link between CR-1 and R2 to bypass R1. 

Answer: A,B 


Q280. Which two statements describe characteristics of HDLC on Cisco routers? (Choose two.) 

A. It supports multiple Layer 3 protocols. 

B. It supports multiplexing. 

C. It supports only synchronous interfaces. 

D. It supports authentication. 

Answer: A,C 

Explanation: 

Cisco High-Level Data Link Controller (HDLC) is the Cisco proprietary protocol for sending data over synchronous serial links using HDLC. Cisco HDLC also provides a simple control protocol called Serial Line Address Resolution Protocol (SLARP) to maintain serial link keepalives. Cisco HDLC is the default for data encapsulation at Layer 2 (data link) of the Open System Interconnection (OSI) stack for efficient packet delineation and error control. The absence of a protocol type field in the HDLC header posed a problem for links that carried traffic from more than one Layer 3 protocol. Cisco, therefore, added an extra Type field to the HDLC header, creating a Cisco-specific version of HDLC. Cisco routers can support multiple network layer protocols on the same HDLC link. For example an HDLC link between two Cisco routers can forward both IPv4 and IPv6 packets because the Type field can identify which type of packet is carried inside each HDLC frame. 

Reference: http://www.cisco.com/c/en/us/td/docs/routers/access/800/819/software/configuration/Guide/ 

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