Cisco 400-201 Online Practice Questions and Exam Preparation

Cisco 400-201 Online Questions & Answers

• Question 461:

  What is the effect of turning on all available downstream carrier tones in a DMT DSL transmission systems?

  A. Downstream RS error correction effectiveness is reduced.
  B. The downstream line rate and throughput remains unchanged, but FEC efficiency is reduced.
  C. The upstream DSL bandwidth is reduced, since less carriers become available for upstream traffic.
  D. The downstream DSL bandwidth is increased.
  D. The downstream DSL bandwidth is increased.

• Question 462:

  What are two main techniques for creating virtualized router entities on Cisco routers running IOS-XR? (Choose two.)

  A. VRF
  B. SDR
  C. HVR
  D. SVR
  C. HVR
  D. SVR

• Question 463:

  A service provider has the following VPLS requirements :

  *A PE must learn dynamically remote PEs that are members of the same VPLS domain

  *The VPLS signaling must be in a pint-to-multipoint fashion way according to RFC 4761 (kompella)

  Which feature must be enabled to meet these requirements?

  A. RSVP signaling
  B. LDP signaling
  C. BGP signaling
  D. RSVP auto-discovery
  E. LDP auto-discovery
  C. BGP signaling

• Question 464:

  Which statement about the Link Control Protocol is true?

  A. LCP is used for basic PPP link setup and operation.
  B. LCP is used for PPP CHAP authentication.
  C. LCP is used for PPP over ATM setup.
  D. LCP is used for PPP over Ethernet setup.
  E. LCP is used for PPP over Frame Relay setup.
  A. LCP is used for basic PPP link setup and operation.

• Question 465:

  A service provider is working to develop an evolving security technique toolset in regards to the increasing amount of attacks. In which scenario Backscatter Trace back solution is recommended?

  A. Rouge DNS/DHCP Servers
  B. Distribution Denial of service
  C. Ping of death
  D. IP Spoofing
  E. Network Attack TCP/UDP Scan
  B. Distribution Denial of service

• Question 466:

  Which two statements best describe the signalling requirements of virtual circuit setup of VPLS and exchange of reachability information (MAC addresses)?

  A. Cisco VPLS does not require the exchange of reachability (MAC addresses) information via a signaling protocol. This information is learned from the data plane using standard address learning, aging, and filtering mechanisms defined for Ethernet bridging.
  B. Cisco VPLS uses directed LDP as a signalling protocol to exchange reachability (MAC addresses) information to avoid maintanance of ARP cache.
  C. In Cisco VPLS the virtual circuit setup uses Multi-Protocol BGP as autodiscovery and signaling mechanism. Using BGP allows BPDUs to be propagated across VPLS in a scaleable fashion.
  D. In Cisco VPLS the virtual circuit setup uses the same LDP signaling mechanism defined for point-to-point services. Using a directed LDP session, each provider edge advertises a virtual circuit label mapping that is used as part of the label stack imposed on the Ethernet frames by the ingress provider edge during packet forwarding.
  A. Cisco VPLS does not require the exchange of reachability (MAC addresses) information via a signaling protocol. This information is learned from the data plane using standard address learning, aging, and filtering mechanisms defined for Ethernet bridging.
  D. In Cisco VPLS the virtual circuit setup uses the same LDP signaling mechanism defined for point-to-point services. Using a directed LDP session, each provider edge advertises a virtual circuit label mapping that is used as part of the label stack imposed on the Ethernet frames by the ingress provider edge during packet forwarding.

• Question 467:

  Which Cisco IOS XR configuration creates an L2VPN using BGP as auto-discovery and LDP a signaling?

  A. l2vpn bridge group bg1 bridge-domain bg1_bd1 interface gig0/6/0/1.1 ! vfi bg1_db1_vifi vpn-id 101 auto discovery bgp rd 101:1 route-target 101:1 signaling-protocol ldp vpls-id 1:101
  B. l2vpn bridge group bg1 bridge-domain bg1_bd1 interface gig0/6/0/1.1 ! vfi bg1_db1_vifi vpn-id 111 auto discovery bgp rd auto route-target 111:1 signaling-protocol ldp ve-id 3
  C. l2vpn bridge group bg1 bridge-domain bg1_bd1 interface gig0/6/0/1.1 ! vfi bg1_db1_vifi vpn-id 111 auto discovery ldp rd auto route-target auto signaling-protocol ldp vpls-id auto
  D. l2vpn bridge group bg1 bridge-domain bg1_bd1 interface gig0/6/0/1.123 ! vfi bg1_db1_vifi vpn-id 123 auto discovery bgp rd 123:3 route-target auto signaling-protocol ldp vpls-id 3
  A. l2vpn bridge group bg1 bridge-domain bg1_bd1 interface gig0/6/0/1.1 ! vfi bg1_db1_vifi vpn-id 101 auto discovery bgp rd 101:1 route-target 101:1 signaling-protocol ldp vpls-id 1:101

• Question 468:

  Which three are optional extensions of the Frame Relay Local Management Interface specification? (Choose three)

  A. Switched virtual circuit
  B. Virtual circuit status
  C. Simple flow control
  D. Multicasting
  E. Permanent virtual circuit
  B. Virtual circuit status
  C. Simple flow control
  D. Multicasting

• Question 469:

  During the modem boot process, how does the modem acquire the downstream channel?

  A. The modem is commanded by the CMTS to set to the specific channel.
  B. The modem uses the default value in the broadcom chipset.
  C. The modem tuner sets a level as defined by the DOCSIS specification.
  D. The modem tuner scans the downstream spectrum until digital QAM modulated signal is encountered
  D. The modem tuner scans the downstream spectrum until digital QAM modulated signal is encountered

• Question 470:

  

  Refer to the exhibit. The PE devices are Cisco ASR 9000 Series that provide L2VPN services according to the EVC model. The customer intends to run several C-tags on both ends of the connection.

  What happens to the existing VLANs on the Layer 2 transport on PEs that face the CEs?

  A. Existing VLANs are removed by default.
  B. Existing VLANs need to be removed by using the rewrite command.
  C. Existing VLANs are preserved by default.
  D. Existing VLANs need to be reconfigured by using the encapsulation command.
  C. Existing VLANs are preserved by default.