[2021-New] Cisco 400-101 Dumps With Update Exam Questions (151-160)

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Q1. Which three statements about EIGRP wide metrics are true? (Choose three.)

A. The maximum metric is 65536.

B. The default delay is 1,000,000 picoseconds.

C. They allow up to 100 hops.

D. They allow up to 256 hops.

E. The default delay is 1,000,000 milliseconds.

F. The maximum metric is 51200.

Answer: A,B,C

Q2. Which two statements are true about IS-IS? (Choose two.)

A. IS-IS DIS election is nondeterministic.

B. IS-IS SPF calculation is performed in three phases.

C. IS-IS works over the data link layer, which does not provide for fragmentation and reassembly.

D. IS-IS can never be routed beyond the immediate next hop.

Answer: C,D

Explanation:

IS-IS runs directly over the data link alongside IP. On Ethernet, IS-IS packets are always 802.3 frames, with LSAPs 0xFEFE while IP packets are either Ethernet II frames or SNAP frames identified with the protocol number 0x800. OSPF runs over IP as protocol number 89.

IS-IS runs directly over layer 2 and hence:

-cannot support virtual links unless some explicit tunneling is implemented

-packets are kept small so that they don't require hop-by-hop fragmentation

-uses ATM/SNAP encapsulation on ATM but there are hacks to make it use VcMux encapsulation

-some operating systems that support IP networking have been implemented to differentiate Layer 3 packets in kernel. Such Oss require a lot of kernel modifications to support IS-IS for IP routing.

-can never be routed beyond the immediate next hop and hence shielded from IP spoofing and similar Denial of Service attacks.

Reference: https://tools.ietf.org/html/draft-bhatia-manral-diff-isis-ospf-00

Q3. Which Carrier Ethernet service supports the multiplexing of multiple point-to-point EVCs across as a single UNI?

A. EPL

B. EVPL

C. EMS

D. ERMS

Answer: B

Explanation:

Ethernet Relay Service (ERS or EVPL)

An Ethernet Virtual Circuit (EVC) is used to logically connect endpoints, but multiple EVCs

could exist per single UNI. Each EVC is distinguished by 802.1q VLAN tag identification.

The ERS network acts as if the Ethernet frames have crossed a switched network, and certain control traffic is not carried between ends of the EVC. ERS is analogous to Frame Relay where the CE-VLAN tag plays the role of a Data-Link Connection Identifier (DLCI). The MEF term for this service is EVPL.

Reference: http://www.cisco.com/c/en/us/td/docs/net_mgmt/ip_solution_center/5-1/carrier_ethernet/user/guide/l2vpn51book/concepts.html

Q4. Which protocol is the encapsulating protocol for mtrace packets?

A. ICMP

B. IGMP

C. PIM

D. GRE

Answer: B

Explanation:

“mtrace” is a diagnostic tool to trace the multicast path from a specified source to a destination for a multicast group. It runs over IGMP protocol. Mtrace uses any information available to it to determine a previous hop to forward the trace towards the source.

Reference: http://www.brocade.com/downloads/documents/html_product_manuals/NI_05500c_MULTI CAST/wwhelp/wwhimpl/common/html/wwhelp.htm#context=NI_MCAST&file=IP_Multicast. 3.04.html

Q5. Refer to the exhibit.

Switch DSW1 should share the same MST region with switch DSW2. Which statement is true?

A. Configure DSW1 with the same version number, and VLAN-to-instance mapping as shown on DSW2.

B. Configure DSW1 with the same region name, number, and VLAN-to-instance mapping as shown on DSW2.

C. DSW2 uses the VTP server mode to automatically propagate the MST configuration to DSW1.

D. DSW1 is in VTP client mode with a lower configuration revision number, therefore, it automatically inherits MST configuration from DSW2.

E. DSW1 automatically inherits MST configuration from DSW2 because they have the same domain name.

Answer: B

Q6. Which BGP feature prevents a router from installing an iBGP learned route in its routing table until the route is validated within the IGP?

A. confederation

B. aggregation

C. advertise-map

D. synchronization

Answer: B

Q7. Which feature of Cisco IOS XE Software allows for platform-independent code abstraction?

A. its security

B. Common Management Enabling Technology

C. the Linux-based environment

D. its modularity

Answer: D

Q8. 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

Q9. Which statement about BGP and diverse path advertisement is true?

A. The BGP best-path selection must be disabled.

B. The BGP best-path selection algorithm has been changed to always ignore the IGP metric.

C. The BGP best-path selection algorithm has been changed so that two BGP paths can be flagged as best in the BGP table.

D. The BGP best-path selection algorithm has not been changed.

E. The BGP best-path selection is disabled for BGP routes for which the feature is enabled.

Answer: D

Explanation:

The BGP Diverse Path Using a Diverse-Path Route Reflector feature allows BGP to distribute an alternative path other than the best path between BGP speakers when route reflectors are deployed. This additional path is added to the best-path, and the best path algorithm still remains unchanged.

Q10. Which two statements about IPsec VTI implementation are true? (Choose two.)

A. The IKE SA can be bound to the VTI and the crypto map.

B. The transform set can be configured only in tunnel mode.

C. SVTIs support only a single IPsec SA.

D. SVTIs support IPv4 packets that carry IPv6 packets.

Answer: B,C