Cisco 642-997 Online Practice Questions and Exam Preparation

Cisco 642-997 Online Questions & Answers

• Question 41:

  What is the grace period in a graceful restart situation?

  A. how long the supervisor waits for NSF replies
  B. how often graceful restart messages are sent after a switchover
  C. how long NSF-aware neighbors should wait after a graceful restart has started before tearing down adjacencies
  D. how long the NSF-capable switches should wait after detecting that a graceful restart has started, before verifying that adjacencies are still valid
  C. how long NSF-aware neighbors should wait after a graceful restart has started before tearing down adjacencies

  ---

  Graceful restart (GR) refers to the capability of the control plane to delay advertising the absence of a peer (going through control-plane switchover) for a "grace period," and thus help minimize disruption during that time (assuming the

  standby control plane comes up). GR is based on extensions per routing protocol, which are interoperable across vendors. The downside of the grace period is huge when the peer completely fails and never comes up, because that slows

  down the overall network convergence, which brings us to the final concept: nonstop routing (NSR).

  NSR is an internal (vendor-specific) mechanism to extend the awareness of routing to the standby routing plane so that in case of failover, the newly active routing plane can take charge of the already established sessions.

  

  

  

  

  

  

  

  Reference: http://www.ciscopress.com/articles/article.asp?p=1395746andseqNum=2

• Question 42:

  Which command is used to associate EID-to-RLOC for a LISP site?

  A. #feature lisp
  B. #ipv6 lisp itr
  C. #ip lisp database-mapping
  D. #ip lisp itr map-resolver
  C. #ip lisp database-mapping

• Question 43:

  Which statement about the Layer 3 card on the Cisco Nexus 5500 Series Switch is true?

  A. BGP support is not provided, but RIP, EIGRP, and OSPF support is provided.
  B. Up to two 4-port cards are supported with up to 160 Gb/s of Layer 3 forwarding capability.
  C. Up to 16 FEX connections are supported.
  D. Port channels cannot be configured as Layer 3 interfaces.
  C. Up to 16 FEX connections are supported.

  ---

  From the Cisco NX-OS 5.1(3)N1(1) release and later releases, each Cisco Nexus 5500 Series device can manage and support up to 24 FEXs without Layer 3. With Layer 3, the number of FEXs supported per Cisco Nexus 5500 Series device

  is 8. With Enhanced vPC and a dual-homed FEX topology each FEX is managed by both Cisco Nexus 5000 Series devices. As a result, one pair of Cisco Nexus 5500 Series devices can support up to 24 FEXs and 16 FEXs for Layer 2 and

  Layer 3.

  Reference:

  http://www.cisco.com/en/US/docs/switches/datacenter/nexus5000/sw/mkt_ops_guides/513 _n1_1/n5k_enhanced_vpc.html

• Question 44:

  Which two statements about SAN zoning on Cisco Nexus switches are true? (Choose two.)

  A. Unlike configured zones, default zone information is not distributed to the other switches in the fabric.
  B. Traffic can either be permitted or denied among members of the default zone. This information is not distributed to all switches. It must be configured in each switch.
  C. The settings for default zone configurations cannot be changed.
  D. To activate a zone set, you must copy the running configuration to the startup configuration after the zone set is configured.
  E. Soft zoning restrictions will not prevent a source device from accessing a device outside its zone, if the source knows the Fibre Channel ID of the destination.
  F. Hard zoning is enforced by the hardware on each FLOGI sent by an N Port.
  B. Traffic can either be permitted or denied among members of the default zone. This information is not distributed to all switches. It must be configured in each switch.
  E. Soft zoning restrictions will not prevent a source device from accessing a device outside its zone, if the source knows the Fibre Channel ID of the destination.

  ---

  Each member of a fabric (in effect a device attached to an Nx port) can belong to any zone. If a member is not part of any active zone, it is considered to be part of the default zone. Therefore, if no zone set is active in the fabric, all devices

  are considered to be in the default zone. Even though a member can belong to multiple zones, a member that is part of the default zone cannot be part of any other zone. The switch determines whether a port is a member of the default zone

  when the attached port comes up. Unlike configured zones, default zone information is not distributed to the other switches in the fabric Traffic can either be permitted or denied among members of the default zone. This information is not

  distributed to all switches; it must be configured in each switch.

  Reference:

  http://www.cisco.com/c/en/us/td/docs/switches/datacenter/mds9000/sw/5_2/configuration/g uides/fabric/DCNM-SAN/fm_fabric/zone.html

• Question 45:

  Which protocol is the foundation for unified fabric as implemented in Cisco NX-OS?

  A. Fibre Channel
  B. Data Center Bridging
  C. Fibre Channel over Ethernet
  D. N proxy virtualization
  E. N Port identifier virtualization
  C. Fibre Channel over Ethernet

  ---

  Fibre Channel over Ethernet (FCoE) is one of the major components of a Unified Fabric. FCoE is a new technology developed by Cisco that is standardized in the Fibre Channel Backbone 5 (FC-BB-5) working group of Technical Committee T11 of the International Committee for Information Technology Standards (INCITS). Most large data centers have huge installed bases of Fibre Channel and want a technology that maintains the Fibre Channel model. FCoE assumes a lossless Ethernet, in which frames are never dropped (as in Fibre Channel) and that therefore does not use IP and TCP. Reference: http://www.cisco.com/c/en/us/products/collateral/switches/nexus-5000-series- switches/white_paper_c11495142.html

• Question 46:

  During the design of a new Cisco Data Center Network, a customer asked when VM-FEX would be used with Cisco Nexus 1000V Switch. Which scenario is most appropriate?

  A. when a host must utilize a vSwitch and a distributed vSwitch
  B. when using Non-UCS Servers to provide virtualization services with Nexus FEX modules
  C. They are mutually exclusive of each other.
  D. when a Cisco UCS C-Series server requires Cisco Nexus 1000V Switch to provide VM connectivity
  C. They are mutually exclusive of each other.

• Question 47:

  Which three options are capabilities of the Cisco Nexus 7000 Series Supervisor Module? (Choose three.)

  A. hardware forwarding on the supervisor module
  B. fully decoupled control plane and data plane with no forwarding on the supervisor module
  C. Sup2 requires Cisco NX-OS 5.1 or later.
  D. Sup2 requires Cisco NX-OS 6.1 or later.
  E. Sup2E supports 8+1 VDC with the N7K-VDC1K9 license per chassis.
  F. Sup2 supports 8+1 VDCs with the N7K-VDC1K9 license per chassis.
  B. fully decoupled control plane and data plane with no forwarding on the supervisor module
  D. Sup2 requires Cisco NX-OS 6.1 or later.
  E. Sup2E supports 8+1 VDC with the N7K-VDC1K9 license per chassis.

• Question 48:

  Which feature must be enabled for Cisco TrustSec FC Link Encryption to work on a Cisco MDS 9000 Series Switch?

  A. crypto IKE
  B. port security
  C. LDAP
  D. FC-SP
  D. FC-SP

• Question 49:

  

  

  When configuring FCoE VLANs and Virtual Fiber Channel (vFC) Interfaces, what guidelines must be followed?

  A. Each vFC interface must be bound to an FCoE-enabled Ethernet or EtherChannel interface or to the MAC address of a remotely connected adapter
  B. Each FC interface must be bound to an FCoE-enabled Ethernet or EtherChannel interface or to the MAC address of a remotely connected adapter
  C. Each vFC interface must be bound to an FC enabled Ethernet or EtherChannel interface or to the MAC address of a remotely connected adapter
  D. Each vFC interface must be bound to an FCoE-enabled vFC or EtherChannel interface or to the MAC address of a remotely connected adapter
  A. Each vFC interface must be bound to an FCoE-enabled Ethernet or EtherChannel interface or to the MAC address of a remotely connected adapter

• Question 50:

  What configuration is required when implementing FCoE?

  A. disable LAN traffic on the interface
  B. configure PortFast on the access port
  C. permit all VLANs on the interface
  D. permit all VSANs on the interface
  A. disable LAN traffic on the interface

  ---

  DCBX allows the switch to send a LAN Logical Link Status (LLS) message to a directly- connected CNA. Enter the shutdown lan command to send an LLS-Down message to the CNA. This command causes all VLANs on the interface that are not enabled for FCoE to be brought down. If a VLAN on the interface is enabled for FCoE, it continues to carry SAN traffic without any interruption.

  Reference: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/fcoe/b_Cisco_Ne xus_5000_Series_NXOS_Fibre_Channel_over_Ethernet_Configuration_Guide_/Cisco_Nexus_5000_Series_NX- OS_Fibre_Channel_over_Ethernet_Configuration_Guide__chapter3.html