[2021-New] Cisco 400-101 Dumps With Update Exam Questions (391-400)

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Q1. Which two statements about the function of a PIM designated router are true? (Choose two.)

A. It forwards multicast traffic from the source into the PIM network.

B. It registers directly connected sources to the PIM rendezvous point.

C. It sends PIM Join/Prune messages for directly connected receivers.

D. It sends IGMP queries.

E. It sends PIM asserts on the interfaces of the outgoing interface list.

Answer: B,C

Explanation:

In PIM ASM and SSM modes, the software chooses a designated router (DR) from the routers on each network segment. The DR is responsible for forwarding multicast data for specified groups and sources on that segment. In ASM mode, the DR is responsible for unicasting PIM register packets to the RP. When a DR receives an IGMP membership report from a directly connected receiver, the shortest path is formed to the RP, which may or may not go through the DR. The result is a shared tree that connects all sources transmitting on the same multicast group to all receivers of that group. In SSM mode, the DR triggers (*, G) or (S, G) PIM join messages toward the RP or the source. The path from the receiver to the source is determined hop by hop. The source must be known to the receiver or the DR.

Reference: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/5_x/nx-os/multicast/configuration/guide/n7k_multic_cli_5x/pim.html#wp1054047

Q2. DRAG DROP

Drag and drop the OSPFv3 LSA type on the left to the functionality it provides on the right.

Answer:

Q3. Which two statements about OSPF route types are true? (Choose two.)

A. The cost of an external type 2 route is the sum of the external and internal costs.

B. The cost of an external type 2 route is the same as the external cost.

C. Intra-area routes originate outside of their area.

D. Inter-area routes originate inside their area.

E. The cost of an external type 1 route is the same as the internal cost.

F. For routes to the same destination, external type 1 routes are preferred over external type 2 routes.

Answer: B,F

Explanation:

External routes fall under two categories, external type 1 and external type 2. The difference between the two is in the way the cost (metric) of the route is being calculated. The cost of a type 2 route is always the external cost, irrespective of the interior cost to reach that route. A type 1 cost is the addition of the external cost and the internal cost used to reach that route. A type 1 route is always preferred over a type 2 route for the same destination.

Reference: http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/7039-1.html

Q4. Refer to the exhibit.

Which command is configured on this router?

A. bgp update-delay 60

B. neighbor 10.100.1.1 maximum-prefix 200

C. neighbor 10.100.1.1 maximum-path 2

D. neighbor 10.100.1.1 ebgp-multihop 2

Answer: B

Explanation:

The BGP Maximum-Prefix feature allows you to control how many prefixes can be received from a neighbor. By default, this feature allows a router to bring down a peer when the number of received prefixes from that peer exceeds the configured Maximum-Prefix limit. This feature is commonly used for external BGP peers, but can be applied to internal BGP peers also. When the maximum number of prefixes has been received, the BGP sessions closes into the IDLE state.

Reference: http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/25160-bgp-maximum-prefix.html

Q5. Which two statements about the default behavior of IS-IS are true? (Choose two.)

A. The default IS-IS router type is L1/L2.

B. The default IS-IS metric type is wide.

C. The default IS-IS interface circuit type is L1/L2.

D. By default, two IS-IS routers must use the same hello interval and hold timer in order to become neighbors.

Answer: A,C

Q6. Refer to the exhibit.

Which BGP feature is being used?

A. fast session deactivation

B. graceful restart

C. PIC

D. graceful shutdown

Answer: A

Q7. Where must the spanning-tree timers be configured if they are not using the default timers?

A. They must be on the root bridge.

B. They must be on any non-root bridge.

C. Changing the default timers is not allowed.

D. Timers must be modified manually on each switch.

Answer: A

Q8. Refer to the exhibit.

Which statement is true?

A. IS-IS has been enabled on R4 for IPv6, single-topology.

B. IS-IS has been enabled on R4 for IPv6, multitopology.

C. IS-IS has been enabled on R4 for IPv6, single-topology and multitopology.

D. R4 advertises IPv6 prefixes, but it does not forward IPv6 traffic, because the protocol has not been enabled under router IS-IS.

Answer: A

Explanation:

When working with IPv6 prefixes in IS-IS, you can configure IS-IS to be in a single topology for both IPv4 and IPv6 or to run different topologies for IPv4 and IPv6. By default, IS-IS works in single-topology mode when activating IPv4 and IPv6. This means that the IS-IS topology will be built based on IS Reachability TLVs. When the base topology is built, then IPv4 prefixes (IP Reachability TLV) and IPv6 prefixes (IPv6 Reachability TLV) are added to each node as leaves, without checking if there is IPv6 connectivity between nodes.

Reference: https://blog.initialdraft.com/archives/3381/

Q9. Which two options are advantages of NetFlow version 9 over NetFlow version 5? (Choose two.)

A. NetFlow version 9 adds support for IPv6 headers.

B. NetFlow version 9 adds support for MPLS labels.

C. NetFlow version 9 adds support for the Type of Service field.

D. NetFlow version 9 adds support for ICMP types and codes.

Answer: A,B

Explanation:

NetFlow version 9 includes support for all of these fields that version 5 supports and can optionally include additional information such as Multiprotocol Label Switching (MPLS) labels and IPv6 addresses and ports.

Q10. Which regular expression will only allow prefixes that originated from AS 65000 and that are learned through AS 65001?

A. ^65000_65001$

B. 65000_65001$

C. ^65000_65001

D. ^65001_65000$

Answer: D

Explanation:

The following table lists the regular expressions and their meanings:

+------------------------------------------------------+

| CHAR | USAGE |

+------------------------------------------------------|

| ^ | Start of string |

|------|-----------------------------------------------|

| $ | End of string |

|------|-----------------------------------------------|

| [] | Range of characters |

|------|-----------------------------------------------|

| - | Used to specify range ( i.e. [0-9] ) |

|------|-----------------------------------------------|

| ( ) | Logical grouping |

|------|-----------------------------------------------|

| . | Any single character |

|------|-----------------------------------------------|

| * | Zero or more instances |

|------|-----------------------------------------------|

| + | One or more instance |

|------|-----------------------------------------------|

| ? | Zero or one instance |

|------|-----------------------------------------------|

| _ | Comma, open or close brace, open or close |

| | parentheses, start or end of string, or space |

+------------------------------------------------------+

Some commonly used regular expressions include:

+-------------+---------------------------+

| Expression | Meaning |

|-------------+---------------------------|

| .* | Anything |

|-------------+---------------------------|

| ^$ | Locally originated routes |

|-------------+---------------------------|

| ^100_ | Learned from AS 100 |

|-------------+---------------------------|

| _100$ | Originated in AS 100 |

|-------------+---------------------------|

| _100_ | Any instance of AS 100 |

|-------------+---------------------------|

| ^[0-9]+$ | Directly connected ASes |

+-------------+---------------------------+

Reference: http://blog.ine.com/2008/01/06/understanding-bgp-regular-expressions/