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Q441. Which two options are requirements to implement 6VPE? (Choose two.) 

A. MPLS between PEs 

B. 6-in-4 tunnels between PEs 

C. MP-BGP VPNv6 exchange 

D. MP-BGP IPv6+label exchange 

E. Any Transport over MPLS 

F. IPv4/IPv6 dual-stack in core 

Answer: A,C 

Q442. Which two statements are true about RSTP? (Choose two.) 

A. By default, RTSP uses a separate TCN BPDU when interoperating with 802.1D switches. 

B. By default, RTSP does not use a separate TCN BPDU when interoperating with 802.1D switches. 

C. If a designated port receives an inferior BPDU, it immediately triggers a reconfiguration. 

D. By default, RTSP uses the topology change TC flag. 

E. If a port receives a superior BPDU, it immediately replies with its own information, and no reconfiguration is triggered. 

Answer: B,D 


The RSTP does not have a separate topology change notification (TCN) BPDU. It uses the topology change (TC) flag to show the topology changes. 


Q443. Which flag in a configuration BPDU instructs all switches to shorten their bridge table aging process from the default 300 seconds to the current forward delay value? 

A. topology change bit 

B. topology change acknowledgment bit 

C. priority bit 

D. max-age bit 



The Root Bridge continues to set the Topology Change flag (TCN bit) in all Configuration BPDUs that it sends out for a total of Forward Delay + Max Age seconds (default = 35 (20+15) seconds). This flag instructs all bridges to shorten their MAC address table (Bridge table) aging process from the default value of 300 seconds to the current Forward Delay value of the bridge (default=15 seconds). The TCA flag is set by the upstream bridge to tell the downstream bridges to stop sending TCN BPDUs. The TC flag is set in configuration BPDU by the Root Bridge to shorten the bridge table age-out period from default 300 seconds to Forward Delay seconds. 

Q444. In the DiffServ model, which class represents the highest priority with the highest drop probability? 

A. AF11 

B. AF13 

C. AF41 

D. AF43 



AF43 — Assured forwarding, high drop probability, Class 4 DSCP, and Flash-override precedence. 

Table of AF Classes and Drop Priority 

Drop Precedence 

Class 1 

Class 2 

Class 3 

Class 4 

Low drop 


DSCP 10 



DSCP 18 



DSCP 26 



DSCP 34 


Medium drop 


DSCP 12 



DSCP 20 



DSCP 28 



DSCP 36 


High drop 


DSCP 14 



DSCP 22 



DSCP 30 



DSCP 38 



Q445. The OSPF database of a router shows LSA types 1, 2, 3 and 7 only. Which type of area is this router connected to? 

A. backbone area 

B. totally stubby area 

C. stub area 

D. not-so-stubby area 


Q446. Refer to the exhibit. 

Which two statements about this configuration are true? (Choose two.) 

A. Spoke devices will be dynamically added to the NHRP mappings. 

B. The next-hop server address must be configured to on all spokes. 

C. The next-hop server address must be configured to on all spokes. 

D. R1 will create a static mapping for each spoke. 

Answer: A,C 


NHRP is a client/server model protocol which is defined by RFC2332. The hub is considered to be the Next Hop Server (NHS) and the spokes are considered to be the Next Hop Client (NHC). The hub must be configured as the next-hop server. NHRP provides a mapping between the inside and outside address of a tunnel endpoint. These mappings can be static or dynamic. In a dynamic scenario, a next-hop server (NHS) is used to maintain a list of possible tunnel endpoints. Each endpoint using the NHS registers its own public and private mapping with the NHS. The local mapping of the NHS must always be static. It is important to note that the branch points to the inside or protected address of the NHS server. This scenario is an example of dynamic mappings. 

Reference: PN_2_Phase2.html 

Q447. Refer to the exhibit. 

Which statement about the debug behavior of the device is true? 

A. The device debugs all IP events for 

B. The device sends all debugging information for 

C. The device sends only NTP debugging information to 

D. The device sends debugging information every five seconds. 



This is an example of a conditional debug, where there is a single condition specified of IP address So, all IP events for that address will be output in the debug. 

Q448. Which statement is true about VPLS? 

A. MPLS is not required for VPLS to work. 

B. VPLS carries packets as Layer 3 multicast. 

C. VPLS has been introduced to address some shortcomings of OTV. 

D. VPLS requires an MPLS network. 



VPLS uses MPLS labels so an MPLS network is required. VPLS MPLS packets have a two-label stack. The outer label is used for normal MPLS forwarding in the service provider's network. If BGP is used to establish the VPLS, the inner label is allocated by a PE as part of a label block. If LDP is used, the inner label is a virtual circuit ID assigned by LDP when it first established a mesh between the participating PEs. Every PE keeps track of assigned inner label, and associates these with the VPLS instance. 


Q449. Now that we’ve generated the key, our next step would be to configure our vty lines for SSH access and specify which database we are going to use to provide authentication to the device. The local database on the router will do just fine for this example. 

LabRouter(config)#line vty 0 4 

LabRouter(config-line)#login local 

LabRouter(config-line)#transport input ssh 

5. You will need to create an account on the local router’s database to be used for authenticating to the device. This can be accomplished with these commands. LabRouter(config)#username XXXX privilege 15 secret XXXX 


Q450. Which two statements about reverse ARP are true? (Choose two.) 

A. Its servers require static mappings. 

B. It works with AutoInstall to configure new devices. 

C. It provides IP addresses for subnet masks. 

D. It provides IP addresses for default gateways. 

E. It requires less maintenance than DHCP. 

Answer: A,B