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Q71. 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 


Q72. Refer to the exhibit. 

Which BGP feature is being used? 

A. fast session deactivation 

B. graceful restart 

C. PIC 

D. graceful shutdown 

Answer: A 


Q73. A configuration includes the line ip route 10.0.0.0 255.0.0.0 172.16.10.10 permanent. 

Which option is a benefit of configuring this static route as permanent? 

A. It allows the route to be redistributed into the network even if the outgoing interface is down. 

B. It allows the route to be saved in the running configuration of the device. 

C. It places a hidden tag on the route that can be matched on other devices. 

D. It allows the route to have a tracking status even if no tracking object is configured. 

Answer: A 


Q74. What are the three HDLC operating modes? (Choose three.) 

A. normal response 

B. asynchronous balanced 

C. synchronous response 

D. asynchronous response 

E. normal balanced 

F. synchronous balanced 

Answer: A,B,D 


Q75. According to RFC 4577, OSPF for BGP/MPLS IP VPNs, when must the down bit be set? 

A. when an OSPF route is distributed from the PE to the CE, for Type 3 LSAs 

B. when an OSPF route is distributed from the PE to the CE, for Type 5 LSAs 

C. when an OSPF route is distributed from the PE to the CE, for Type 3 and Type 5 LSAs 

D. when an OSPF route is distributed from the PE to the CE, for all types of LSAs 

Answer: C 

Explanation: 

If an OSPF route is advertised from a PE router into an OSPF area, the Down bit (DN) is set. Another PE router in the same area does not redistribute this route into iBGP of the MPLS VPN network if down is set. 

RFC 4577 says: 

“When a type 3 LSA is sent from a PE router to a CE router, the DN bit in the LSA Options field MUST be set. This is used to ensure that if any CE router sends this type 3 LSA to a PE router, the PE router will not redistribute it further. When a PE router needs to distribute to a CE router a route that comes from a site outside the latter’s OSPF domain, the PE router presents itself as an ASBR (Autonomous System Border Router), and distributes the route in a type 5 LSA. The DN bit [OSPF-DN] MUST be set in these LSAs to ensure that they will be ignored by any other PE routers that receive them.” 

For more information about Down bit according to RFC 4577 please read more herE. http://tools.ietf.org/html/rfc4577#section-4.2.5.1. 


Q76. Refer to the exhibit. 

Switch DSW1 should share the same MST region with switch DSW2. Which statement is true? 

A. Configure DSW1 with the same version number, and VLAN-to-instance mapping as shown on DSW2. 

B. Configure DSW1 with the same region name, number, and VLAN-to-instance mapping as shown on DSW2. 

C. DSW2 uses the VTP server mode to automatically propagate the MST configuration to DSW1. 

D. DSW1 is in VTP client mode with a lower configuration revision number, therefore, it automatically inherits MST configuration from DSW2. 

E. DSW1 automatically inherits MST configuration from DSW2 because they have the same domain name. 

Answer: B 


Q77. Which option is the default point of insertion for the BGP cost community? 

A. before best path calculation 

B. after best path calculation 

C. after the IGP metric comparison 

D. after the router ID comparison 

Answer: C 


Q78. Which technology can be used to prevent flooding of IPv6 multicast traffic on a switch? 

A. IGMP snooping 

B. IGMP filtering 

C. MLD snooping 

D. MLD filtering 

Answer: C 

Explanation: 

MLD snooping allows the switch to examine MLD packets and make forwarding decisions based on their content. You can configure the switch to use MLD snooping in subnets that receive MLD queries from either MLD or the MLD snooping querier. MLD snooping constrains IPv6 multicast traffic at Layer 2 by configuring Layer 2 LAN ports dynamically to forward IPv6 multicast traffic only to those ports that want to receive it. 

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SX/configuration/guide/book/snoopmld.html 


Q79. A network engineer is extending a LAN segment between two geographically separated data centers. Which enhancement to a spanning-tree design prevents unnecessary traffic from crossing the extended LAN segment? 

A. Modify the spanning-tree priorities to dictate the traffic flow. 

B. Create a Layer 3 transit VLAN to segment the traffic between the sites. 

C. Use VTP pruning on the trunk interfaces. 

D. Configure manual trunk pruning between the two locations. 

Answer: C 


Q80. Which two options are disadvantages of a commingled dual-tier WAN rate-based Ethernet circuit? (Choose two.) 

A. It requires the maintenance of separate chassis. 

B. It has limited scalability. 

C. It requires additional CPU resources at the subscriber end. 

D. It is more difficult to secure. 

E. It can increase the likelihood of packet drops. 

Answer: A,E