Download New Latest (May) Cisco 640-878 Actual Tests 11-20

Ensurepass

 

QUESTION 11

Refer to the exhibit.

 

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The access list has been configured on the Gi0/0/0/0 interface in the inbound direction. Which four packets that are sourced from 10.1.1.1 TCP port 1060, if theyare routed to the Gi0/0/0/0 interface, will be permitted? (Choose four)

 

A.

destination IP address: 192.168.15.37, destination TCP port: 8080

B.

destination IP address: 192.168.15.41, destination TCP port: 8080

C.

destination IP address: 192.168.15.49, destination TCP port: 8080

D.

destination IP address: 192.168.15.36, destination TCP port: 80

E.

destination IP address: 192.168.15.46, destination TCP port: 80

F.

destination IP address: 192.168.15.49, destination TCP port: 80

 

Answer: CDEF

Explanation:

QUESTIONNO: 9

Which two statements about NAT64 are true? (Choose two.)

 

 

A.NAT64 packets traverse two IPv4 addressing domains.

 

 

 

 

B.NAT64 packets are translated two times.

 

C.There are two types of NAT64 (stateful or stateless).

D.NAT is performed by the CPE and also by the service provider edge router.

E.The DNS64 server embeds the IPv4 address from the DNS A record with a preconfigured IPv6 translation prefix.

 

Answer: C, E

http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6553/white_paper_c11- 676278.html

 

All viable translation scenarios are supported by NAT64, and therefore NAT64 is becoming the most sought translation technology. AFT using NAT64 technology can be achieved by either stateless or stateful means:

?Stateless NAT64, defined in RFC 6145, is a translation mechanism for algorithmically mapping IPv6 addresses to IPv4 addresses, and IPv4 addresses to IPv6 addresses. Like NAT44, it does not maintain any bindings or session state while performing translation, and it supports both IPv6-initiated and IPv4-initiated communications. ?Stateful NAT64, defined in RFC 6146, is a stateful translation mechanism for translating IPv6 addresses to IPv4 addresses, and IPv4 addresses to IPv6 addresses. Like NAT44, it is called stateful because it creates or modifies bindings or session state while performing translation. It supports both IPv6-initiated and IPv4-initiated communications using static or manual mappings.

DNS64, an optional component defined in RFC 6147, when used in conjunction with NAT64, would trick the IPv6 hosts into thinking that the IPv4 destination as an IPv6 address, by synthesizing AAAA (quad A) resource records from A resource records.

 

 

QUESTION 12

Refer to the two show output examples below. The switch with the e8ba.70b5.7180 MAC address is the root bridge for which VLAN or VLANs?

 

 

 

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A.

VLAN 1

B.

VLAN 70

C.

VLAN 80

D.

VLANs 1, 70, and 80

E.

VLANs1 and 70

F.

VLANs 1 and 80

G.

VLANs 70 and 80

 

Answer: C

 

 

QUESTION 13

HOTSPOT

 

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Answer:

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A.

 

B.

 

C.

 

D.

 

 

Answer:

 

 

QUESTION 14

Refer to the partial CiscoIOS XR BGP configuration exhibit.

 

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Which two statements are true? (Choose two)

 

A.

This router uses its Loopback 0 interface IP address when establishing BGP peering with the 10.2.1.1 router.

B.

This router uses its Loopback 0 interface IP address whenestablishing BGP peering with

 

 

the 192.168.101.11 router.

C.

Test1 refers to a route policy that is defined using the RPL.

D.

Both the IBGP and EBGP sessions will be authenticated.

E.

The IBGP session is missing the mandatory route-policy configuration.

 

Answer: AC

 

 

QUESTION 15

Which two statements about the BGP weight attribute on Cisco routersare true? (Choose two.)

 

A.

It is a well-known discretionary attribute.

B.

It is only locally significant.

C.

Routes with higher weight are the preferred routes.

D.

It is used to influence the inbound traffic from the upstream AS.

E.

It is set to 100 by default.

 

Answer: BC

 

 

QUESTION 16

Cisco IP NGN service providers can offer multiple services to their customers by usingwhich type of technology in their core networks?

 

A.

ATM

B.

SONET/SDH

C.

Frame Relay

D.

IP/MPLS

E.

PBB

 

Answer: D

 

 

QUESTION 17

Which four statements about REP configurations on a Cisco ME 3400 switch port are true? (Choose four.)

 

A.

The port must be an NNI type and must be in trunk mode.

B.

Use the rep segment number command to enable REP on the switch port.

C.

A REP segment cannot be wrapped into a ring topology. REP supports only a topology where each REP segment has two exit points via two edge switches.

D.

The portwhere the segment terminates is called the edge port.

E.

With REP, at least one port is always blocked in any given segment-that is, the alternate port.

F.

If a failure occurs within the segment, the blocked port goes to the forwarding state after it goesthrough the listening state and the learning state.

 

Answer: ABDE

Explanation: http://www.cisco.com/en/US/docs/switches/metro/me3400/software/release/12.2_40_se/co nfiguration/guide/swrep.html

 

Resilient Ethernet Protocol (REP) on the Cisco ME 3400E Ethernet Access switch. REP is a Cisco proprietary protocol that provides an alternative to Spanning Tree Protocol (STP) to control network loops, handle link failures, and improve convergence time. REP controls a group of ports connected in a segment, ensures that the segment does not create any bridging loops, and responds to link failures within the segment. REP provides a basis for constructing more complex networks and supports VLAN load balancing.

 

REP Configuration Guidelines

Follow these guidelines when configuring REP:

·We recommend that you begin by configuring one port and then configure the contiguous ports to minimize the number of segments and the number of blocked ports. ·If more than two ports in a segment fail when no external neighbors are configured, one port goes into a forwarding state for the data path to help maintain connectivity during configuration. In the show rep interface privileged EXEC command output, the Port Role for this port shows as Fail Logical Open; the Port Role for the other failed port shows as Fail No Ext Neighbor. When the external neighbors for the failed ports are configured, the ports go through the alternate port state transitions and eventually go to an open state or remain as the alternate port, based on the alternate port election mechanism.

 

·REP ports must be Layer 2 trunk ports.

·Be careful when configuring REP through a Telnet connection. Because REP blocks all VLANs until another

REP interface sends a message to unblock it, you might lose connectivity to the switch if you enable REP in a Telnet session that accesses the switch through thesame interface. ·You cannot run REP and STP or REP and Flex Links on the same segment or interface. ·If you connect an STP network to the REP segment, be sure that the connection is at the

 

 

 

segment edge. An STP connection that is not at the edge could causea bridging loop because STP does not run on REP segments. All STP BPDUs are dropped at REP interfaces.

·You must configure all trunk ports in the segment with the same set of allowed VLANs, or a misconfigurations occurs.·If REP is enabled on two ports ona switch, both ports must be either regular segment ports or edge ports.

REP ports follow these rules:

­If only one port on a switch is configured in a segment, the port should be an edge port. ­If two ports on a switch belong to the same segment, both ports must be edge ports or both ports must be regular segment ports.

­If two ports on a switch belong to the same segment and one is configured as an edge port and one as a regular segment port (a misconfiguration), the edge port is treated as a regular segment port.

·REP interfaces come up in a blocked state and remains in a blocked state until notified that it is safe to unblock. You need to be aware of this to avoid sudden connection losses. ·REP sends all LSL PDUs in untagged frames on the native VLAN. The BPA message sent to the Cisco multicast address is sent on the administration VLAN, which is VLAN 1 by default.

·REP ports can not be configured as one of these port types:

­SPAN destination port

­Private VLAN port

­Tunnel port

­Access port

·On a Cisco ME-3400 switch, REP ports must be network node interfaces (NNI). User- network interfaces

(UNIs) cannot be REP ports.

·REP is supported on EtherChannels, but not on an individual port that belongs to an EtherChannel.

·There is a maximum of 64 REP segments per switch.

 

 

QUESTION 18

What is dual IOS mode on the Cisco ASR 1001 Router?

 

A.

redundant IOS processes that are running on the active RP and standby RP

B.

active and standby IOS processes that are running on a single RP

C.

separate Cisco IOS XE and IOSXR processes that are running on a single RP

D.

separate Cisco IOS XE and IOS XR processes that are running on two different RPs

E.

checkpointed redundant IOS processes that are running on two different RPs in active/active mode

 

Answer: B

Explanation:

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QUESTION 19

A VLAN is a logical grouping of switch ports that belong to which two of these? (Choose two.)

 

A.

the same virtual switch cluster

B.

the same IP subnet

C.

the same collision domain

D.

the same broadcast domain

E.

the samevirtual routing and forwarding instance

 

Answer: BD

 

 

QUESTION 20

Which file extension indicates abootable installation file in Cisco IOS XR software?

 

A.

.bin

B.

.tar

C.

.smu

D.

.pie

E.

.vm

F.

.mini

 

Answer: E

Explanation:

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