Cisco 640-864 Online Practice Questions and Exam Preparation

Cisco 640-864 Online Questions & Answers

• Question 61:

  Which Gigabit Ethernet media type provides the longest reach without a repeater?

  A. 1000Base-CX
  B. 1000Base-LX
  C. 1000Base-SX
  D. 1000Base-T
  B. 1000Base-LX

• Question 62:

  A network engineer is following the three tiered Network Hierarchical Model. At which tier is route summarization implemented?

  A. core
  B. distribution
  C. backbone
  D. access
  B. distribution

• Question 63:

  Which three are valid Layer 2 access designs? (Choose three.)

  A. Looped Triangle
  B. Looped Square
  C. Looped U
  D. Loop-Free Triangle
  E. Loop-Free Square
  F. Loop-Free U
  A. Looped Triangle
  B. Looped Square
  F. Loop-Free U

• Question 64:

  Which three are considered as technical constraints when identifying network requirements? (Choose three.)

  A. support for legacy applications
  B. bandwidth support for new applications
  C. limited budget allocation
  D. policy limitations
  E. limited support staff to complete assessment
  F. support for existing legacy equipment
  G. limited timeframe to implement
  A. support for legacy applications
  B. bandwidth support for new applications
  F. support for existing legacy equipment

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  Network design might be constrained by parameters that limit the solution. Legacy applications might still exist that must be supported going forward, and these applications might require a legacy protocol that may limit a design. Technical

  constraints include the following:

  Existing wiring does not support new technology.

  Bandwidth might not support new applications.

  The network must support exiting legacy equipment.

  Legacy applications must be supported (application compatibility).

• Question 65:

  Which protocol is the recommended first-hop redundancy protocol for an existing infrastructure that contains multiple vendors and platforms?

  A. HSRP
  B. VRRP
  C. IGRP
  D. OSPF
  B. VRRP

• Question 66:

  A company must deploy an IGP routing protocol on an Enterprise Network. Where should route summarization be implemented?

  A. distribution
  B. core
  C. access
  D. backbone
  A. distribution

• Question 67:

  When you are designing a large IPv6 multivendor network, which IGP does Cisco recommend that you use?

  A. OSPFv3
  B. EIGRP for IPv6
  C. BGP
  D. RIPng
  A. OSPFv3

• Question 68:

  Refer to the exhibit.

  

  Which layer is the distribution layer?

  A. Layer A
  B. Layer B
  C. Layer C
  D. Layers A and B form a consolidated core and distribution layer
  B. Layer B

• Question 69:

  Which one of these statements is true concerning the data center distribution (aggregation) layer design?

  A. With Layer 3 at the aggregation layer, the physical loops in the topology must still be managed by STP.
  B. The boundary between Layer 2 and Layer 3 must reside in the multilayer switches, independent of any other devices such as firewalls or content switching devices.
  C. A mix of both Layer 2 and Layer 3 access is sometimes the most optimal.
  D. In a small data center, the aggregation layer can connect directly to the campus core, exchanging IP routes and MAC address tables.
  C. A mix of both Layer 2 and Layer 3 access is sometimes the most optimal.

• Question 70:

  Which two of these practices are considered to be best practices when designing the access layer for the enterprise campus? (Choose two.)

  A. Implement all of the services (QoS, security, STP, and so on) in the access layer, offloading the work from the distribution and core layers.
  B. Always use a Spanning Tree Protocol; preferred is Rapid PVST+.
  C. Use automatic VLAN pruning to prune unused VLANs from trunked interfaces to avoid broadcast propagation.
  D. Avoid wasted processing by disabling STP where loops are not possible.
  E. Use VTP transparent mode to decrease the potential for operational error.
  B. Always use a Spanning Tree Protocol; preferred is Rapid PVST+.
  E. Use VTP transparent mode to decrease the potential for operational error.

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  When designing the building access layer, you must consider the number of users or ports required to size up the LAN switch. Connectivity speed for each host should also be considered. Hosts might be connected using various technologies

  such as Fast Ethernet, Gigabit Ethernet, or port channels. The planned VLANs enter into the design. Performance in the access layer is also important. Redundancy and QoS features should be considered. The following are recommended best practices for the building access layer:

  Limit VLANs to a single closet when possible to provide the most deterministic and highly available topology.

  Use Rapid Per-VLAN Spanning Tree Plus (RPVST+) if STP is required. It provides the faster convergence than traditional 802.1d default timers.

  Set trunks to ON and ON with no-negotiate.

  Manually prune unused VLANs to avoid broadcast propagation (commonly done on the distribution switch).

  Use VLAN Trunking Protocol (VTP) Transparent mode, because there is little need for a common VLAN database in hierarchical networks.

  Disable trunking on host ports, because it is not necessary. Doing so provides more security and speeds up PortFast.

  Consider implementing routing in the access layer to provide fast convergence and Layer 3 load balancing.

  Use the switchport host commands on server and end-user ports to enable PortFast and disable channeling on these ports.

  Use Cisco STP Toolkit, which provides

  PortFast: Bypass listening-learning phase for access ports ?Loop GuarD. Prevents alternate or root port from becoming designated in absence of bridge protocol data units (BPDU)

  Root GuarD. Prevents external switches from becoming root ?BPDU GuarD. Disables PortFast-enabled port if a BPDU is received Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 3, Page 85