Download New Updated (June) Cisco 640-878 Practice Test 61-70

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QUESTION 61

On Cisco IOS XR software, what are the four valid address-family configuration command options in static route configuration mode? (Choose four.)

 

A.

address-family ipv4 unicast

B.

address-family ipv6 unicast

C.

address-family ipv4 multicast

D.

address-family ipv6 multicast

E.

address-family vpnv4

F.

address-family vpnv6

 

Correct Answer: ABCD

Explanation:

clip_image001

 

 

QUESTION 62

Which three statements about service provider network requirements are true? (Choose three.)

 

A.

Service provider networks are becoming more specialized, with providers offering only one service.

B.

Service providers connect customers to the Internet.

C.

Jitter and packet loss are no longer an issue.

D.

Multiple access technologies are supported.

E.

Customers can connect directly using copper, wireless, or fiber-optic links.

 

Correct Answer: BDE

 

 

 

 

 

QUESTION 63

Which three are common ISP access network technologies? (Choose three.)

 

A.

DSL

B.

Cable modem

C.

DWDM

D.

MPLS

E.

PON

F.

MP-BGP

 

Correct Answer: ABE

Explanation:

http://blog.ioshints.info/2010/02/passive-optical-networks.html

 

 

QUESTION 64

Which three Cisco platforms are classified as core routers? (Choose three.)

 

A.

Cisco XR 12000

B.

Cisco ME 3400

C.

Cisco ASR 1006

D.

Cisco CRS-3

E.

Cisco ASR 9010

F.

Cisco 3900

 

Correct Answer: ADE

Explanation:

Both the ASR 9010 and ASR 9006 routers are designed with key capabilities to help deliver the services of tomorrow. Providing increased bandwidth capabilities for network devices at economically viable prices is one of the primary criteria for true carrier-transport platforms.While traditional service prices continue to decline, the Cisco ASR 9000 Series helps establish a new financial reality by facilitating reliable and scalable video, nextgeneration mobile aggregation, and advanced Carrier Ethernet service offerings.

The Cisco® XR 12000 Series and Cisco 12000 Series routers compose a portfolio of intelligent routing solutions that scale from 2.5- to n x10 Gbps capacity per slot, enabling carrier-class IP/Multiprotocol Label Switching (MPLS) networks and accelerating the evolution to IP Next- Generation Networks. Built upon a foundation of investment protection, this portfolio delivers up to 1.28-terabits-per-second switching capacity with wire-speed feature performance, scalability, and graceful hardware and software upgrade paths.

 

 

QUESTION 65

Which statement about Cisco IOS XE software is true?

 

A.

It uses a two-stage configuration process.

B.

It is identical in look and feel to Cisco IOS software.

C.

It runs on the Cisco ASR 9010 platform.

D.

Packages can be added using the install add and install activate commands.

E.

It runs on the Cisco ME 3400 platform.

 

Correct Answer: B

Explanation:

http://www.cisco.com/en/US/prod/collateral/iosswrel/ps9442/ps11192/ps11194/QA_C67- 622903.html

 

The IOS feature set for routing and switching is unmatched in the industry, delivering functionality required for business critical applications. Preserving these advantages of IOS to our customers is critical for Cisco. IOS XE retains the exact same look and feel of IOS, while providing enhanced future-proofing and improved functionality. In IOS XE, IOS 15.0 runs as a single daemon within a modern Linux operating system. Additional system functions now run as additional, separate processes in the host OS environment. The operation, support and management of IOS XE does not require re-training from classic IOS.

 

 

QUESTION 66

Which three statements about VLAN implementation in a Layer 2 switch environment are true? (Choose three.)

 

A.

The Cisco IOS switchport access vlan interface configuration command is used to configure the native VLAN on the switch port.

B.

802.1AD supports VLAN overlap.

C.

VLANs can span across multiple switches.

D.

802.1Q encapsulation is used to identify different VLANs on a trunk port.

E.

Inter-VLAN routing is performed between VLAN tunnel ports.

 

Correct Answer: BCD

Explanation:

IEEE 802.1ad[note 1] is an Ethernet networking standard informally known as IEEE 802.1QinQ and is an amendment to IEEE standard IEEE 802.1Q-1998. The technique is also known as provider bridging, Stacked VLANs or simply QinQ or Q-in-Q.

 

The original 802.1Q specification allows a single VLAN header to be inserted into an Ethernet frame. QinQ allows multiple VLAN headers to be inserted into a single frame, an essential capability for implementing Metro Ethernet network topologies. Just as QinQ extends 802.1Q, QinQ itself is extended by other Metro Ethernet protocols.[specify] In a multiple VLAN header context, out of convenience the term “VLAN tag” or just “tag” for short is often used in place of “802.1Q VLAN header”. QinQ allows multiple VLAN tags in an Ethernet frame; together these tags constitute a tag stack. When used in the context of an Ethernet frame, a QinQ frame is a frame that has 2 VLAN 802.1Q headers (double-tagged).

 

There is a mild confusion regarding the naming because the 802.1ad standard was grown out of the 802.1QinQ protocol (which was developed based the trademarked method 802.1Q, with capital “Q” as a distinction instead of the 802.1q as the standardised protocol) which originally used 0x9100 as ethernet type instead of 0x88a8. While the network industry usually mix the naming the proper, standardised name is 802.1ad which sometimes gets appended by the other alternative names mentioned above; the plain “802.1QinQ” name usually refers to the old standard which is now considered obsolete

 

 

 

 

 

 

 

 

 

 

 

QUESTION 67

Refer to the configuration example exhibit. Which statement is true?

 

clip_image003

 

< /tr>

A.

A trunk port has been created and VLAN has been allowed.

B.

An access port has been created on a UNI.

C.

A customer VLAN of 209 is configured.

D.

A QinQ VLAN of 118 is configured.

 

Correct Answer: D

Explanation:

http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/12.2/54sg/configuration/guide/tunnel.html#wp1026594

 

 

QUESTION 68

Which two statements about the link state routing process are true? (Choose two.)

 

A.

It uses the DUAL algorithm.

B.

It uses metrics such as AS path.

C.

All routers in the area have link state databases.

D.

The administrative distance is 1 by default.

E.

Each router in the area floods LSPs to all neighbors.

 

Correct Answer: CE

 

 

QUESTION 69

Which two statements about carrier-grade NAT are true? (Choose two.)

 

A.

It conserves IPv4 addresses.

B.

A service provider issues private IP addresses to its customers.

C.

A service provider translates the private IP address of its customer to another private IP address.

D.

It is implemented on the CE and PE routers.

E.

It is designed to simplify IPv6 addressing.

 

Correct Answer: AB

Explanation:

http://www.cisco.com/en/US/docs/routers/crs/software/crs_r3.9.1/cg_nat/configuration/guide/cgc391cgn.html#wp1268988

 

Carrier Grade NAT Overview

Carrier Grade Network Address Translation (CGN) is a large scale NAT that is capable of providing private IPv4 to public IPv4 translation in the order of millions of translations to support several hundred thousand subscribers and bandwidth throughput of at least 10 Gbps full-duplex.

 

CGN is a workable solution to the IPv4 address depletion problem while offering a way for service provider subscribers and content providers to implement a graceful transition to IPv6. CGN employs network address and port translation (NAPT) methods to aggregate many private IP addresses into fewer public IPv4 addresses. For example, a single public IPv4 address with a pool of 32 K port numbers supports 320 individual private IP subscribers assuming each subscriber requires 100 ports (for examp
le, each TCP connection needs one port number). A CGN requires IPv6 to assist with the transition from IPv4 to IPv6.

 

 

QUESTION 70

DRAG DROP

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Correct Answer:

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