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Building Cisco Service Provider Next-Generation Networks Part 2
640-878 Exam
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Question: 1
Which spanning-tree mode can be used to map several VLANs to a single spanning-tree instance?
A. MST
B. PVST+
C. PVRST+
D. RSTP
Question: 2
Which spanning-tree mode uses the name command to confgure a region name?
A. MST
B. PVST+
C. PVRST+
D. RSTP
Question: 3
Answer: A
Answer: A
Which procedure is used as the last resort disaster recovery procedure to completely replace the
currently installed IOS XR softare on Cisco IOS XR routers?
A. netboot
B. turboboot
C. install recovery
D. install rollback
E. install add and install actvate
Answer: B
Explanatonn
htpn::ttt.cisco.com:en:/S:docs:routers:crs:softare:crsrr_.4:migraton:guide:tbupgapp.pd.
Question: 4
Which fle extension indicates a bootable installaton fle in Cisco IOS XR softare?
A. .bin
B. .tar
C. .smu
D. .pie

E. .vm
F. .mini
Answer: E
Explanatonn
Question: 5
When confguring an ACL entry, thich nettork and tildcard mask matches only IP addresses
14.8.1__.4 to 14.8.151.255?
A. 14.8.1__.4 4.4.3.255
B. 14.8.1__.4 4.4.7.255
C. 14.8.1__.4 4.4.15.255
D. 14.8.1__.4 4.4.252.255
E. 14.8.1__.4 4.4.2_8.255
F. 14.8.1__.4 4.4.2_4.255
Question: 6
Answer: B
Which IP addresses are matched by the permit 192.168.84.6_ 4.4.4.15 access-list entry?
A. 192.168.84.6_ to 192.168.84.255
B. 192.168.84.6_ to 192.168.84.96
C. 192.168.84.6_ to 192.168.84.95
D. 192.168.84.6_ to 192.168.84.84
E. 192.168.84.6_ to 192.168.84.79

Answer: E
Question: 7
Which tto statements about NAT___ are true? (Choose tto.)
A. NAT___ packets are translated three tmes.
B. NAT packets traverse three IPv_ addressing domains.
C. NAT___ needs to tork together tith DNS6_.
D. There are tto types o. NAT___ (state.ul or stateless).
E. NAT is per.ormed by the CPE and also by the service provider router.
Answer: B, E
Explanatonn
Carrier-grade NAT (CGN), also knotn as large-scale NAT (LSN), is an approach to IPv_ nettork design
in thich end sites, in partcular residental nettorks, are confgured tith private nettork addresses
that are translated to public IPv_ addresses by middlebox nettork address translator devices
embedded in the nettork operator's nettork, permitng the sharing o. small pools o. public
addresses among many end sites. This shifs the NAT .uncton and confguraton thereo. .rom the
customer premises to the Internet service provider nettork.
Carrier-grade NAT has been proposed as an approach .or mitgatng IPv_ address exhauston..11
Critcs o. carrier-grade NAT argue the .olloting aspectsn
Like any .orm o. NAT, it breaks the end-to-end principle..21
It has signifcant security, scalability, and reliability problems, by virtue o. being state.ul.
It makes record keeping .or lat-en.orcement operatons more difcult.
It makes it impossible to host services on tell knotn ports.
It does not solve the IPv_ address exhauston problem then a routable IP address is needed, such as
in teb hostng.
One use scenario o. CGN can be described as NAT___,.31 because some customer's connectons to
public servers tould pass through three diferent IPv_ addressing domainsn the customer's otn
private nettork, the carrier's private nettork, and the public Internet.
Another CGN scenario is Dual-Stack Lite, in thich the carrier's nettork uses IPv6 and thus only tto
IPv_ addressing domains are needed.
Question: 8
Re.er to the exhibit.
The access list has been confgured on the Gi4:4:4:4 inter.ace in the inbound directon. Which .our
packets that are sourced .rom 14.1.1.1 TCP port 1464, i. they are routed to the Gi4:4:4:4 inter.ace,
till be permited? (Choose .our)

A. destnaton IP addressn 192.168.15.37, destnaton TCP portn 8484
B. destnaton IP addressn 192.168.15._1, destnaton TCP portn 8484
C. destnaton IP addressn 192.168.15._9, destnaton TCP portn 8484
D. destnaton IP addressn 192.168.15.36, destnaton TCP portn 84
E. destnaton IP addressn 192.168.15._6, destnaton TCP portn 84
F. destnaton IP addressn 192.168.15._9, destnaton TCP portn 84
Answer: C, D, E, F
Question: 9
Which tto statements about NAT6_ are true? (Choose tto.)
A. NAT6_ packets traverse tto IPv_ addressing domains.
B. NAT6_ packets are translated tto tmes.
C. There are tto types o. NAT6_ (state.ul or stateless).
D. NAT is per.ormed by the CPE and also by the service provider edge router.
E. The DNS6_ server embeds the IPv_ address .rom the DNS A record tith a preconfgured IPv6
translaton prefx.
Answer: C, E
Explanatonn
htpn::ttt.cisco.com:en:/S:prod:collateral:iosstrel:ps6537:ps6553:thiterpaperrc11-
676278.html
All viable translaton scenarios are supported by NAT6_, and there.ore NAT6_ is becoming the most
sought translaton technology. AFT using NAT6_ technology can be achieved by either stateless or
state.ul meansn
• Stateless NAT6_, defned in RFC 61_5, is a translaton mechanism .or algorithmically mapping IPv6
addresses to IPv_ addresses, and IPv_ addresses to IPv6 addresses. Like NAT__, it does not maintain
any bindings or session state thile per.orming translaton, and it supports both IPv6-initated and
IPv_-initated communicatons.
• State.ul NAT6_, defned in RFC 61_6, is a state.ul translaton mechanism .or translatng IPv6
addresses to IPv_ addresses, and IPv_ addresses to IPv6 addresses. Like NAT__, it is called state.ul
because it creates or modifes bindings or session state thile per.orming translaton. It supports
both IPv6-initated and IPv_-initated communicatons using statc or manual mappings.
DNS6_, an optonal component defned in RFC 61_7, then used in conjuncton tith NAT6_, tould
trick the IPv6 hosts into thinking that the IPv_ destnaton as an IPv6 address, by synthesizing AAAA
(quad A) resource records .rom A resource records.
Question: 10
Re.er to the exhibit.

The access list has been confgured on the Gi4:4:4:4 inter.ace in the inbound directon. Which tto
packets that are sourced .rom 172.16.1.1 TCP port 1454, i. they are routed to the Gi4:4:4:4
inter.ace, till be permited? (Choose tto)
A. destnaton IP addressn 14.14.192.241, destnaton TCP portn 84
B. destnaton IP addressn 14.14.193.255, destnaton TCP portn 84
C. destnaton IP addressn 14.14.196.1, destnaton TCP portn 84
D. destnaton IP addressn 14.14.195.25_, destnaton TCP portn 23
E. destnaton IP addressn 14.14.193.1_5, destnaton TCP portn 23
F. destnaton IP addressn 14.14.197.32, destnaton TCP portn 23
Question: 11
Answer: A, B
Which frst-hop router redundancy protocol uses the actve virtual gatetay to assign a virtual MAC
address to the actve virtual .ortarders?
A. HSRP
B. VRRP
C. GLBP
D. FHRP
Explanatonn
htpn::ttt.cisco.com:en:/S:docs:ios:12r2t:12r2t15:.eature:guide:frglbp.html
Question: 12
Answer: C
Which tto statements about the BGP teight atribute on Cisco routers are true? (Choose tto.)
A. It is a tell-knotn discretonary atribute.
B. It is only locally signifcant.
C. Routes tith higher teight are the pre.erred routes.
D. It is used to infuence the inbound trafc .rom the upstream AS.
E. It is set to 144 by de.ault.
Answer: B, C

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