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2017 Apr 400-101 training

Q281. Which two protocols are not protected in an edge router by using control plane policing? (Choose two.) 




D. Telnet 

Answer: A,B 


A CoPP policy can limit a number of different packet types that are forwarded to the control plane. Traffic destined for the switch CPU includes: 

. Address Resolution Protocol (ARP) 

. First-hop redundancy protocol packets 

. Layer 2 control packets 

. Management packets (telnet, Secure Shell [SSH] Protocol, Simple Network Management Protocol [SNMP]) <--- C and D are not correct. 

. Multicast control packets 

. Routing protocol packets 

. Packets with IP options 

. Packets with time to live (TTL) set to 1 

. Packets that require ACL logging 

. Packets that require an initial lookup (first packet in a flow: FIB miss) 

. Packets that have don't support hardware switching/routing 

Reference: http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-6500-series-switches/white_paper_c11_553261.html 

Q282. Which two options are contained in the MSG part of a syslog message? (Choose two.) 

A. TAG field 

B. CONTENT field 

C. three-digit priority value 

D. IP address of the sending device 

E. TLS port number 

Answer: A,B 


Drag each GETVPN component on the left to its function on the right. 


Q284. Which three capabilities are provided by MLD snooping? (Choose three.) 

A. dynamic port learning 

B. IPv6 multicast router discovery 

C. user-configured ports age out automatically 

D. a 5-minute aging timer 

E. flooding control packets to the egress VLAN 

F. a 60-second aging timer 

Answer: A,B,D 


Like IGMP snooping, MLD snooping performs multicast router discovery, with these characteristics: 

. Ports configured by a user never age out. 

. Dynamic port learning results from MLDv1 snooping queries and IPv6 PIMv2 packets. 

. If there are multiple routers on the same Layer 2 interface, MLD snooping tracks a single multicast router on the port (the router that most recently sent a router control packet). 

. Dynamic multicast router port aging is based on a default timer of 5 minutes; the multicast router is deleted from the router port list if no control packet is received on the port for 5 minutes. 

. IPv6 multicast router discovery only takes place when MLD snooping is enabled on the switch. 

Reference: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750/software/release/12-2_55_se/configuration/guide/scg3750/swv6mld.pdf 

Q285. Which BGP aggregate address configuration advertises only the aggregate address, with attributes inherited from the more specific routes? 

A. summary-only as-set 

B. as-set 

C. summary 

D. summary-only 




router bgp 300 

neighbor remote-as 100 

neighbor remote-as 200 

neighbor remote-as 400 

aggregate-address summary-only as-set 

!--- With the as-set configuration command, the aggregate 

!--- inherits the attributes of the more-specific routes. 

Reference: http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/5441-aggregation.html 

Leading 400-101 exam prep:


Drag and drop the MPLS term on the left to the function it performs on the right. 



Drag and drop the argument of the mpls ip cef load-sharing command on the left to the function it performs on the right. 


Q288. 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. 


Q289. Refer to the exhibit. 

Which action must you take to enable the WAN link to function properly? 

A. Enter a clock rate on the DCE interface. 

B. Enter a clock rate on the DTE interface. 

C. Enter a compression algorithm on both interfaces. 

D. Configure both interfaces for HDLC encapsulation. 



When connecting a serial cable to the serial interface of the router, clocking is provided by an external device, such as a CSU/DSU device. A CSU/DSU (Channel Service Unit/Data Service Unit) is a digital-interface device used to connect a router to a digital circuit. The router is the DTE (Data Terminal Equipment) and the external device is the DCE (Data Communications Equipment), where the DCE provides the clocking. However, in some cases we might connect two routers back-to-back using the routers’ serial interfaces (Example. Inside the router labs). Each router is a DTE by default. Since clocking is required to enable the interface, one of the two routers should function as DCE and should provide clocking. This can be done by using the "clock rate" command, from the interface configuration mode. 

Reference: http://www.omnisecu.com/cisco-certified-network-associate-ccna/how-to-configure-router-serial-interfaces.php 

Q290. Assume that the following MAC addresses are used for the bridge ID MAC address by four different switches in a network. Which switch will be elected as the spanning-tree root bridge? 

A. SwitchA uses MAC 1000.AA-AA-AA-AA-AA-AA. 

B. SwitchB uses MAC 2000.BB-BB-BB-BB-BB-BB. 

C. SwitchC uses MAC 3000.CC-CC-CC-CC-CC-CC. 

D. SwitchD uses MAC 4000.DD-DD-DD-DD-DD-DD. 



The switch with the highest switch priority (the lowest numerical priority value) is elected as the root switch. If all switches are configured with the default priority (32768), the switch with the lowest MAC address in the VLAN becomes the root switch. 

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960/software/release/12-2_53_se/configuration/guide/2960scg/swstp.html