[Free] 2019(Nov) EnsurePass Cisco 300-165 Dumps with VCE and PDF 41-50

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Question No.41

Which policy-map action performs congestion avoidance?

  1. priority

  2. bandwidth

  3. queue-limit

  4. random-detect

Correct Answer: D


Congestion avoidance techniques monitor network traffic loads in an effort to anticipate and avoid congestion at common network bottlenecks. Congestion avoidance is achieved through packet dropping. Among the more commonly used congestion avoidance mechanisms is Random Early Detection (RED), which is optimum for high-speed transit networks. Cisco IOS QoS includes an implementation of RED that, when configured, controls when the router drops packets. If you do not configure Weighted Random Early Detection (WRED), the router uses the cruder default packet drop mechanism called tail drop.

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/qos/configuration/guide/fqos_c/qcfconav.html

Question No.42

What is an Overlay Transport Virtualization extended VLAN?

  1. the VLAN used to locate other AEDs

  2. the VLAN used to access the overlay network by the join interface

  3. the user VLAN that exists in multiple sites

  4. the VLAN that must contain the overlay interface

Correct Answer: C Explanation: Functions of OTV

Maintains a list of overlays

Maintains a list of configured overlay parameters such as name, multicast address, encapsulation type, authentication, and OTV feature sets

Maintains the state of the overlay interface

Maintains the status of OTV VLAN membership from Ethernet infrastructure and the state of the authoritative edge device (AED) from IS-IS

Maintains a database of overlay adjacencies as reported by IS-IS

Maintains IP tunnel information and manages the encapsulation for data sent on the overlay network

Manages delivery groups (DGs) for each overlay by snooping multicast traffic and monitoring traffic streams for active DGs

Configures, starts, and stops the OTV IS-IS instance Interfaces with IP multicast to join provider multicast groups for each overlay

Question No.43

What must be enabled on the interface of a multicast-enabled device to support the Source Specific Multicast feature?

  1. IGMP version 3

  2. IGMP version 2

  3. IGMP version 1

  4. PIM

Correct Answer: A


IGMP is the Internet Engineering Task Force (IETF) standards track protocol used for hosts to signal multicast group membership to routers. Version 3 of this protocol supports source filtering, which is required for SSM. To run SSM with IGMPv3, SSM must be supported in the Cisco IOS router, the host where the application is running, and the application itself. IGMP v3lite and URD are two Cisco-developed transition solutions that enable the immediate development and deployment of SSM services, without the need to wait for the availability of full IGMPv3 support in

host operating systems and SSM receiver applications. IGMP v3lite is a solution for application developers that allows immediate development of SSM receiver applications switching to IGMPv3 as soon as it becomes available. URD is a solution for content providers and content aggregators that enables them to deploy receiver applications that are not yet SSM enabled (through support for IGMPv3). IGMPv3, IGMP v3lite, and URD interoperate with each other, so that both IGMP v3lite and URD can easily be used as transitional solutions toward full IGMPv3 support in hosts. Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/ip/configuration/guide/fipr_c/1cfssm.html

Question No.44

Which two items are required components of VN-Link in software? (Choose two.)

  1. VDC

  2. VEM

  3. vPC

  4. VSM

  5. VRRP

Correct Answer: BD


The Cisco Nexus 1000V Series consists of two main types of components that can virtually emulate a 66-slot modular Ethernet switch with redundant supervisor functions:

Virtual Ethernet module (VEM)-data plane: This lightweight software component runs inside the hypervisor. It enables advanced networking and security features, performs switching between directly attached virtual machines, provides uplink capabilities to the rest of the network, and effectively replaces the vSwitch. Each hypervisor is embedded with one VEM.

Virtual supervisor module (VSM)-control plane: This standalone, external, physical or virtual appliance is responsible for the configuration, management, monitoring, and diagnostics of the overall Cisco Nexus 1000V Series system (that is, the combination of the VSM itself and all the VEMs it controls) as well as the integration with VMware vCenter. A single VSM can manage up to 64 VEMs. VSMs can be deployed in an active-standby model, helping ensure high availability. Reference: http://www.cisco.com/c/en/us/solutions/collateral/switches/nexus-1000v-switch- vmware-vsphere/white_paper_c11-525307.html

Question No.45

Which two issues explain why a packet is not being routed as desired in a policy-based routing configuration? (Choose two.)

  1. The route map is not applied to the egress interface.

  2. The route map is not applied to the ingress interface.

  3. The next hop that is configured in the route map is not in the global routing table.

  4. The next hop that is configured in the route map has a higher metric than the default next hop.

  5. The next hop that is configured in the route map has a lower metric than the default next hop.

Correct Answer: CE


The next hop that is configured in the route map is not in the global routing table then the packet will not be forwarded as desired. The next hop that is configured in the route map has a higher metric than the default next hop.

Question No.46

Which feature enables NIV?

  1. EHV

  2. vPC

  3. Cisco FabricPath

  4. Cisco OTV

  5. VN-Tag

Correct Answer: A


EHV is the feature that enables NIV.

Question No.47

What is the Overlay Transport Virtualization site VLAN used for?

  1. to allow the join interfaces at different sites to communicate

  2. to detect devices at the site that are not capable of OTV

  3. to allow multiple site AEDs to communicate with each other

  4. to detect other OTV edge devices in the site

Correct Answer: D


The edge device performs OTV functions: it receives the Layer 2 traffic for all VLANs that need to be extended to remote locations and dynamically encapsulates the Ethernet frames into IP packets that are then sent across the transport infrastructure. It is expected that at least two OTV edge devices are deployed at each data center site to improve the resiliency.

Reference: http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Data_Center/DCI/whitepaper/DCI3_OT V_Intro/DCI_1.html

Question No.48

Which statement about scalability in Cisco OTV is true?

  1. The control plane avoids flooding by exchanging MAC reachability.

  2. IP-based functionality provides Layer 3 extension over any transport.

  3. Any encapsulation overhead is avoided by using IS-IS.

  4. Unknown unicasts are handled by the authoritative edge device.

Correct Answer: A


Cisco calls the underlying concept of OTV traffic forwarding quot;MAC routingquot;, since it behaves as if you are routing Ethernet frames over the DCI transport. OTV uses a control plane protocol to proactively propagate MAC address reachability before traffic is allowed to pass, which eliminates dependency on flooding mechanism to either learn MAC addresses or forward unknown unicasts. Reference: http://www.computerworld.com/article/2515468/data-center/layer-2-data-center- interconnect-options.html

Question No.49

What mode is required on a Cisco Nexus 7000 32-port 10-GB module port group to allow equal access to the 10-GB port controller?

  1. dedicated

  2. assigned

  3. shared

  4. community

Correct Answer: C


You can share 10 Gb of bandwidth among a group of ports (four ports) on a 32-port 10- Gigabit Ethernet module. To share the bandwidth, you must bring the dedicated port administratively down, specify the ports that are to share the bandwidth, change the rate mode to shared, and then bring the ports administratively up.

Reference: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/5_x/nx- os/interfaces/configuration/guide/if_cli/if_basic.html#70242

Question No.50

Refer to the exhibit. This multilayer Cisco Nexus switch had been the active virtual gateway for Group 1 before it became temporarily unavailable. What will happen to GLBP Group 1 when this device becomes available again?


  1. The currently active router remains active.

  2. It depends on the priority value that is configured active on the router.

  3. The Cisco Nexus switch becomes the active virtual gateway after 600 seconds.

  4. It depends on the weighting values that are configured active on the router.

Correct Answer: A


GLBP prioritizes gateways to elect an active virtual gateway (AVG). If multiple gateways have the same priority, the gateway with the highest real IP address becomes the AVG. The AVG assigns a virtual MAC address to each member of the GLBP group. Each member is the active virtual forwarder (AVF) for its assigned virtual MAC address, forwarding packets sent to its assigned virtual MAC address.

The AVG also answers Address Resolution Protocol (ARP) requests for the virtual IP address. Load sharing is achieved when the AVG replies to the ARP requests with different virtual MAC


Note: Packets received on a routed port destined for the GLBP virtual IP address terminate on the local router, regardless of whether that router is the active GLBP router or a redundant GLBP router. This termination includes ping and Telnet traffic. Packets received on a Layer 2 (VLAN) interface destined for the GLBP virtual IP address terminate on the active router.

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