Cisco 300-320 Online Practice Questions and Exam Preparation

Cisco 300-320 Online Questions & Answers

• Question 411:

  An engineer is configuring QoS to meet the following requirement. All traffic that exceeds the allocated bandwidth will still traverse the infrastructure, but will be buffered and queued for later transmission. Which QoS tool meets these requirements?

  A. Per-Hop behaviours
  B. Weighted Fair Queuing
  C. IP Precedence
  D. Shaping
  D. Shaping

• Question 412:

  A Layer 2 switch in the network has recently started broadcasting traffic out of every port and is impacting network performance. The engineering department determines that a MAC overflow attack is the cause. Which two features can protect and mitigate the damage of the attacks? (Choose two.)

  A. Storm Control
  B. Port Security
  C. SPAN
  D. BPDU Filters
  E. IP Source Guard
  F. VACLs
  A. Storm Control
  B. Port Security

• Question 413:

  A network Engineer is designing a hierarchical design and needs to optimize WAN design. On what group of devices can a network engineer summaries routes to remote WAN sites?

  A. Core
  B. Distribution
  C. Data Center Distribution WAN Edge
  D. WAN Edge
  E. Campus access distribution layer
  B. Distribution

  ---

  Summarize at Service Distribution. It is important to force summarization at the distribution towards WAN Edge and towards campus and data center

• Question 414:

  An engineering team must allow communications between a new two-tier application in a Cisco Application-Centric Infrastructure environment.

  Which two elements must be configured to allow communications between two endpoint groups that represents the application? (Choose two.)

  A. context
  B. filter
  C. access control list
  D. contract
  E. route map
  A. context
  B. filter

• Question 415:

  Which protocol should be configured if a network administrator has the following requirements?

  -

  Multiple physical gateways participating simultaneously in packet forwarding.

  -

  All hosts in the VLAN configured with the same default gateway address.

  A. HSRP
  B. VRRP
  C. VTP
  D. GLBP
  D. GLBP

• Question 416:

  In what situation must spanning-tree be implemented?

  A. when first hop redundancy protocol exists with redundant Layer 2 links between distribution switches
  B. when a VLAN spans access layer switches to support business applications
  C. when trunks need to extend multiple VLANs across access switches
  D. when it is necessary to speed up network convergence in case of link failure
  A. when first hop redundancy protocol exists with redundant Layer 2 links between distribution switches

  ---

  Previous answer was “B” but that has now been changed to “A”.

  STP (L2 loop prevention mechanism) should be implemented in topologies where possible loops may occur and redundant L2 links between distribution switches is a very good example as long as the links are not channelled (PC, vPC,

  MEC). If the redundant L2 links between distribution switches are channelled, the topology is loop free so no STP is required but the doesn't say anything about that.

  With regards to answer “A”, VLAN can be stretched between multiple access switches via distribution layer and still be loop free so (know from experience).

• Question 417:

  An engineer is using communities to control the routing information among BGP peers. A specific route must be known by iBGP peers, but it must not be propagated to any upstream eBGP peers. Which BGP community accomplishes this goal?

  A. no-advertise
  B. no-peer
  C. no-export-subconfed
  D. no-export
  D. no-export

• Question 418:

  A company requires real-time SAN replication between two remote locations. What is the standard path selection protocol for fabric routing?

  A. FSPF
  B. FICON
  C. FCOE
  D. SCSI
  A. FSPF

• Question 419:

  What are two advantages of a L2 looped data center design model? (Choose two.)

  A. promotes Layer 2 high availability
  B. prevents VLAN propagation
  C. allows sharing of service modules
  D. eliminates the use of STP
  E. improves data transfer speeds
  A. promotes Layer 2 high availability
  C. allows sharing of service modules

• Question 420:

  An engineer is attempting to improve OSPF network performance and discovers that the entire SPT recomputes whenever a type 1 or type 2 LSA is received within an area. Which action can optimize SPT operations?

  A. Tune LSA throttling thresholds.
  B. Enable incremental SPF.
  C. Configure totally stubby areas throughout the domain.
  D. Summarize networks on all ABRs.
  B. Enable incremental SPF.

  ---

  https://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/ospfispf.html#wp1027184 Benefits of OSPF Incremental SPF OSPF uses Dijkstra's SPF algorithm to compute the shortest path tree (SPT). During the computation of the SPT,

  the shortest path to each node is discovered. The topology tree is used to populate the routing table with routes to IP networks. When changes to a Type-1 or Type-2 link-state advertisement (LSA) occur in an area, the entire SPT is

  recomputed. In many cases, the entire SPT need not be recomputed because most of the tree remains unchanged. Incremental SPF allows the system to recompute only theaffected part of the tree. Recomputing only a portion of the tree

  rather than the entire tree results in faster OSPF convergence and saves CPU resources. Note that if the change to a Type-1 or Type-2 LSA occurs in the calculating router itself, then the full SPT is performed.

  Incremental SPF is scheduled in the same way as the full SPF. Routers enabled with incremental SPF and routers not enabled with incremental SPF can function in the same internetwork.