Cisco 400-151 Exam Questions

Question 6 of 489

Which two options are functions of the 6LoWPAN header? (Choose two.)

packet fragmentation and reassembly

limit the lifespan of a packet (TTL)

IPv6 header compression

cyclic redundancy check

Layer 2 encryption

Correct Answer: A, C

Question 7 of 489

Which three options are benefits of the vPC peer switch feature? (Choose three.)

After the peer link comes up, it performs an ARP bulk sync over CFSoE to the peer switch

It improves convergence forLayer 3 flows.

It allows a pair of vPC peer devices to appear as a single STP root in the Layer 2.

It simplifies STP configuration by configuring both vPC with the same STP priority.

It eliminates the recommendation to pin the STP root to the vPCprimary switch. CDE

Correct Answer:

Question 8 of 489

Which two statements about IP-directed broadcast are true? (Choose two.)

The destination address in the IP header of the packet is rewritten to the configured IP broadcast address for the subnet, and the packet is sent as a link-layer broadcast.

An IP-directed broadcast is an IP packet whose destination address is a valid broadcast address, and it originates from a node that is also part of the same subnet.

A switch that is not directly connectedto its destination subnet forwards an IP-directed broadcast in the same way it forwards unicast IP packets destined to a host on that subnet.

All switches in the network forward an IP-directed broadcast in the same way they forward multicast IP packets.

Correct Answer: A, C

Question 9 of 489

Which statement about glean throttling in Cisco NX-OS is true?

The traffic shaping feature in Cisco NX-OS to avoid bottle necks in the network.

Cisco NX-OS supports a rate-limiting feature to manage the access bandwidth policy for a network by ensuring that traffic falling within specified rate parameters is sent, while dropping packets that exceed the acceptable amount of traffic or sending them a different priority.

When forwarding an incoming IP packet in a line card, if the Address Resolution Protocol request for the next hop is not resolved, the line card forwards the packets to the supervisor. The supervisor resolves the MAC address for the next hop and programs the hardware.

The traffic policing feature manages the maximum rate of traffic through a token bucket algorithm. The token bucket algorithm can use the user-configured values to determine the maximum rate of traffic allowed on an interface at a given moment in time.

Correct Answer: C

Glean throttling in Cisco NX-OS refers to the process by which a line card, upon receiving an incoming IP packet, will forward packets to the supervisor if the Address Resolution Protocol (ARP) request for the next hop is unresolved. The supervisor then resolves the MAC address for the next hop and programs the necessary hardware. This is a mechanism to handle unresolved ARP requests and manage the forwarding process efficiently.

Question 10 of 489

Which two guidelines apply to private VLAN configuration when you are running FabricPath (Choose two.)

On the F-Series modules, user-configured static MAC addresses are programmed on all forwarding engines that have ports in that VLAN.

The system does support hierarchical static MAC addresses.

FabricPath ports can be put into a private VLAN.

All VLANs in a private VLAN must be in the same VLAN mode; either CE or FabricPath.

Correct Answer: A, D