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CCIE Routing and Switching Written Exam v5.1

QUESTION 491

Refer to the exhibit. Which two issues can cause the interface VLAN10 to be down/down? (Choose two.)

 

clip_image001

 

A.

The VLAN is inactive or has been removed from the VLAN database.

B.

STP is in a forwarding state on the port.

C.

A Layer 2 access port is configured with VLAN10, but is in a down/down state.

D.

The autostate exclude feature was used on interface VLAN10.

 

Correct Answer: AC

 

 

QUESTION 492

Which three features require Cisco Express Forwarding? (Choose three.)

 

A.

NBAR

B.

AutoQoS

C.

fragmentation

D.

MPLS

E.

UplinkFast

F.

BackboneFast

 

Correct Answer: ABD

Explanation:

QoS Features That Require CEF

 

These class-based QoS features are supported only on routers that run CEF.

 

Network Based Application Recognition (NBAR) provides intelligent network classification. For more information, refer to Network Based Application Recognition.

 

The AutoQoS -VoIP feature simplifies and speeds up the implementation and provisioning of QoS for VoIP traffic. This feature is enabled with the help of the auto qos voip command. CEF must be enabled at the interface or ATM PVC before the auto qos command can be used. For more information about this feature and its prerequisites, refer to AutoQoS – VoIP.

 

From MPLS Fundamentals – Luc De Ghein

Why Is CEF Needed in MPLS Networks?

Concerning MPLS, CEF is special for a certain reason; otherwise, this book would not explicitly cover it. Labeled packets that enter the router are switched according to the label forwarding information base (LFIB) on the router. IP packets that enter the router are switched according to the CEF table on the router. Regardless of whether the packet is switched according to the LFIB or the CEF table, the outgoing packet can be a labeled packet or an IP packet

 

Reference: http://www.cisco.com/c/en/us/support/docs/asynchronous-transfer-mode-atm/ip-to-atm-class-of-service/4800-cefreq.html

 

 

QUESTION 493

DRAG DROP

Drag and drop the OSPF network type on the left to the correct category of timers on the right.

 

clip_image003

 

Correct Answer:

clip_image005

 

 

QUESTION 494

You are configuring a DHCPv6 client for a DHCPv6 server with the prefix delegation feature. Which option is a result of the interface configuration when you enter the command ipv6 address autoconfig default?

 

A.

a static IPv6 default route pointing to the upstream DHCP server

B.

a static IPv6 default route pointing to the upstream DHCP relay

C.

a static IPv6 default route pointing to the upstream router

D.

a temporary stateless address, formed from the EUI-64 bit address and the prefix from the route advertisement of the upstream router

 

Correct Answer: A

 

 

QUESTION 495

Which bit should be set in the link-state PDU of an IS-IS L1/L2 router to indicate that it is a potential exit point of the area?

 

A.

the ABR bit

B.

the ATT bit

C.

the down bit

D.

the P bit

 

Correct Answer: B

Explanation:

Default routing is achieved in two distinct ways with Integrated IS-IS:

 

clip_image007Attached bit–Set by a Level 1/Level 2 router in its own Level 1 LSP and used to indicate to all Level 1 routers (within the area) that this router is a potential exit point of the area. Level 1-only routers will default to the nearest attached Level 2 router.

clip_image007[1]Default information originate–Can be configured in Level 1 as well as Level 2. The default route (0.0.0.0/0) is inserted in the router LSP (Level 1 or Level 2, according to the configuration command) and the LSP is flooded according to the router type (Level 1 or Level 2). A Level 2 router doesn’t need to have a default route to originate a default route.

 

Reference: http://www.cisco.com/en/US/products/ps6599/products_white_paper09186a00800a3e6f.shtml

 

 

QUESTION 496

Which two statements about NPTv6 are true? (Choose two.)

 

A.

The translation is invisible to applications that hard code IP information within the application logic.

B.

It is a one-way stateful translation for the IPv6 address.

C.

Translation is 1:1 at the network layer.

D.

It is a two-way stateless translation for the network prefix.

 

Correct Answer: CD

Explanation:

This document describes a stateless, transport-agnostic IPv6-to-IPv6 Network Prefix Translation (NPTv6) function that provides the address-independence benefit associated with IPv4-to-IPv4 NAT (NAPT44) and provides a 1:1 relationship between addresses in the “inside” and “outside” prefixes, preserving end-to-end reachability at the network layer NPTv6 Translation is stateless, so a “reset” or brief outage of an NPTv6 Translator does not break connections that traverse the translation function, and if multiple NPTv6 Translators exist between the same two networks, the load can shift or be dynamically load shared among them. NPTv6 is defined to include a two-way, checksum-neutral, algorithmic translation function, and nothing else.

Reference: https://tools.ietf.org/html/rfc6296

 

 

QUESTION 497

Which two technologies are supported by EIGRP? (Choose two.)

 

A.

clear-text authentication

B.

MD5 authentication

C.

stub routing

D.

multiple areas

Correct Answer: BC

Explanation:

The IP Enhanced IGRP Route Authentication feature provides MD5 authentication of routing updates from the EIGRP routing protocol. The MD5 keyed digest in each EIGRP packet prevents the introduction of unauthorized or false routing messages from unapproved sources.

The EIGRP stub routing feature improves network stability, reduces resource utilization, and simplifies the stub device configuration.

Stub routing is commonly used in hub-and-spoke network topologies. In a hub-and-spoke network, one or more end (stub) networks are connected to a remote device (the spoke) that is connected to one or more distribution devices (the hub). The remote device is adjacent to one or more distribution devices. The only route for IP traffic to reach the remote device is through a distribution device.

References:

http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/configuration/15-s/ire-15-sbook/ire-rte-auth.html

http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/configuration/15-s/ire-15-sbook/ire-eigrp-stub-rtg.html

 

 

QUESTION 498

Which two options are interface requirements for turbo flooding? (Choose two.)

 

A.

The interface is Ethernet.

B.

The interface is configured for ARPA encapsulation.

C.

The interface is PPP.

D.

The interface is configured for GRE encapsulation.

E.

The interface is configured for 802.1Q encapsulation.

 

Correct Answer: AB

Explanation:

In the switch, the majority of packets are forwarded in hardware; most packets do not go through the switch CPU. For those packets that do go to the CPU, you can speed up spanning tree-based UDP flooding by a factor of about four to five times by using turbo-flooding. This feature is supported over Ethernet interfaces configured for ARPA encapsulation.

Reference: http://www.cisco.com/c/en/us/td/docs/switches/metro/me3400/software/release/12-2_50_se/configuration/guide/scg/swiprout.html

 

 

QUESTION 499

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.

 

Correct Answer: BF

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

 

 

QUESTION 500

Into which two pieces of information does the LISP protocol split the device identity? (Choose two.)

 

A.

Routing Locator

B.

Endpoint Identifier

C.

Resource Location

D.

Enterprise Identifier

E.

LISP ID

F.

Device ID

 

Correct Answer: AB

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