2014年9月7日 星期日

CCIE SP 350-029 Question 181-210

CCIE SP Written Exam (Version 3.0)



Number: 350-029
Passing Score: 790
Time Limit: 120 min
File Version: 421Q+69




QUESTION 181
Which two routers support cable access? (Choose two.) 
A. ME3000 
B. uBR10000 
C. ASR9000 
D. CRS-1 
E. ME3600 
F. uBR7200 








Correct Answer: BF




QUESTION 182
In PPPoA architecture, which two methods are most commonly deployed? (Choose two) 
A. Terminating PPP sessions at the service provider 
B. PPP framing 
C. PPP multiplexing 
D. GRE tunneling 
E. L2TP tunneling 














Correct Answer: AE



QUESTION 183
Which are three advantages of PPPoA implementation? (Choose three) 

A. NAP and NSP provide secure access to corporate gateways without managing end-to-end PVCs. NAP and NSP use Layer 3 routing, Layer 2 Forwarding, or
Layer 2 Tunneling Protocol tunnels. Hence, they can scale their business models for selling wholesale service. 
B. The NSP can oversubscribe by deploying idle and session timeouts using an industry standard RADIUS server for each subscriber. 
C. Only a single session per CPE on one virtual channel (VC). The username and password are configured on the CPE, so all users behind the CPE for that
particular VC can access only one set of services. Users cannot select different sets of services, although using multiple VCs and establishing different PPP
session on different VCs is possible. 
D. If a single IP address is provided to the CPE, and NAT or PAT is implemented, certain pplications such as IPTV, which embed IP information in the payload,
well not work. Additionally, if an IP subnet feature is used, an IP address also has to be reserved for the CPE. 
E. PPPoA can use the features on the Cisco Service Selection Gateway (SSG) 





Correct Answer: ABE




QUESTION 184
Which four of these key points should be considered during implementation of PPPoA architecture? (Choose four) 
A. The number of subscribers that will be serviced currently and in the future because this affects the number of required PPPoA sessions 
B. The types of applications that the NSP offers to the end subscriber 
C. The capacity of ATM and Frame Relay interworking on the NSP 
D. In the case of more than one user, whether all users need to reach the same final destination or service, or they all have different service destinations 
E. Whether the service provider or the final service destination is providing the IP address to the CPE of the subscriber 








Correct Answer: ABDE




QUESTION 185
Which three of these statements about PPPoE are true? (Choose three.) 
A. PPPoE can provide a host with access to a destination over Ethernet. You can have only one PPPoE session per PVC. 
B. You must install PPPoE client software on all hosts that connect to the Ethernet segment. This means that the access provider must maintain a CPE. 
C. You cannot use PPPoE with Cisco Service Selection Gateway. 
D. PPPoE implementation is susceptible to broadcast storms and possible denial-of-service attacks. 
E. Per-session accounting is possible, which allows the service provider to charge the subscriber based on session time for various services offered. The service
provider can also require a minimum access charge. 









Correct Answer: BDE







QUESTION 186
In a cable HFC plant, what is a modulator? 
A. Set top box 
B. Diplex filter 
C. Local head end 
D. Fiber node 













Correct Answer: A




QUESTION 187
What is the effect of turning on all available downstream carrier tones in a DMT DSL transmission systems? 
A. Downstream RS error correction effectiveness is reduced. 
B. The downstream line rate and throughput remains unchanged, but FEC efficiency is reduced. 
C. The upstream DSL bandwidth is reduced, since less carriers become available for upstream traffic. 
D. The downstream DSL bandwidth is increased. 










Correct Answer: D




QUESTION 188
During the modem boot process, how does the modem acquire the downstream channel? 
A. The modem is commanded by the CMTS to set to the specific channel. 
B. The modem uses the default value in the broadcom chipset. 
C. The modem tuner sets a level as defined by the DOCSIS specification. 
D. The modem tuner scans the downstream spectrum until digital QAM modulated signal is encountered 













Correct Answer: D




QUESTION 189

What is the effect of changing DMT interleaved delay from 3 milliseconds to 15 milliseconds? 
A. Latency remains the same, but throughput is decreased. 
B. Latency remains the same, but error correction effectives may also be reduced. 
C. Latency is increased, but faster error correction occurs. 
D. Fewer ATM PVCs can be provisioned on DSL line. 







Correct Answer: C



QUESTION 190

Typical ADSL broadband Internet access requires a username and password to be entered on end-user PC connected to the ADSL modem in order for the end
user to gain access to the Internet. If a Cisco ADSL router is used instead of an ADSL modem, what functionality is required on the Cisco ADSL router so the enduser connected to the Cisco ADSL router can access the Internet without entering a username and password? 

A. Route Bridge Encapsulation (RBE) 
B. PPPoA 
C. Integrated Routing and Bridging (IRB) 
D. AAA 
E. PPPoE client 










Correct Answer: E




QUESTION 191
In Ethernet Aggregation application which option is needed when the U-PE connects to an N-PE and broadband remote access servers? 

A. Ethernet Multipoint Service (EMS) 
B. VPLS 
C. E1 
D. Wire Service 











Correct Answer: A




QUESTION 192

Option 10C is an implementation of Inter-AS MPLS VPN. Which two statements about Option 10C are true? (Choose two.) 
A. Great scalability is offered 
B. Route Target Rewrite must be configured on ASBRs 
C. Multihop EBGP is utilized between route reflectors 
D. Multihop EBGP is utilized between ASBRs 
E. The ASBRs hold VPNv4 routes 









Correct Answer: AC



QUESTION 193
Which four statements about the Carrier Supporting Carrier (CSC) feature are true? (Choose four.) 
A. MPLS is required between the PE and CE routers that connect the backbone carrier to the customer carrier. 
B. The backbone carrier must enable the PE router to check that the packets it receives from the CE router contain only the labels that the PE router advertised to
the CE router. 
C. Every packet that crosses the backbone carrier must be encapsulated so that the packet includes MPLS labels 
D. AII PE routers that link the backbone carrier to the customer carrier must run Route Target Rewrite. 
E. A routing protocol is required between the PE and CE routers that connect the backbone carrier to the customer carrier. The routing protocol enables the
customer carrier to exchange IGP routing information with the backbone carrier. 










Correct Answer: ABCE



QUESTION 194
In the Carrier Supporting Carrier (CsC) feature, which two protocols run between CSC-PE and CSC-CE. (Choose two) 
A. IGP and RSVP 
B. EBGPv4 with a sending community 
C. IGP and EBGPv4 
D. IGP and LDP 
E. EBGPv4 with a sending label 










Correct Answer: DE




QUESTION 195
Option 10A (back-to-back VRF) is an implementation of inter-AS MPLS VPN. Which of four statements about option 10A are not true? (Choose four.) 
A. MPLS is required between the ASBRs. 
B. ASBR must hold all routing information. 
C. It is a scalable solution. 
D. It is a simple solution. 
E. MP-EBGP is used to exchange routes between ASBRs. 









Correct Answer: ACDE





QUESTION 196
Identify the differences of option 10A, as opposed to option 10C, for interAS vpn offerings For option 10A? (Choose three). 
A. Greater scalability is offered 
B. The ASBR holds VPNv4 routes 
C. Relative technical simplicity is offered 
D. Lower relative security is offered 
E. Multihop eBGP between ASBRs is utilized 
F. Better suitability for InterProvider VPNs is provided 







Correct Answer: BCF



QUESTION 197
Which two features prevent routing loops between the OSPF sites of a customer when the sites are multihomed or a backdoor link is used between the sites?
(Choose two.) 

A. sham link 
B. down bit 
C. virtual link 
D. Site of Origin 
E. domain tag 









Correct Answer: BE




QUESTION 198
Which IOS features are used to avoid Routing loops when dynamic Routing protocols are used between PE and CE in MPLS-VPN networks? (Choose two) 
A. BGP cost community 
B. BGP feature allow-as in 
C. Access-list Control in Distance Vector protocol like RIP and EIGRP. 
D. SHAM links with OSPF 
E. RPF Reverse Path forwarding. 
F. Site Of Origin SOO. 











Correct Answer: CF




QUESTION 199
If the OSPF protocol is used to connect customer edge (CE) routers to service provider edge (PE) routers in the VPN backbone, which two options best describe
the use of SHAM links? 
A. A sham-link is created between any two VPN sites that belong to the same OSPF area and share an OSPF backdoor link 
B. A sham-link is seen as an intra-area link between PE routers, an OSPF adjacency is created and database is exchanged 
C.Asham-link is created between two directly connected PE routers so that it is preferred over the low speed backdoor door 
D.Asham-link is part of OSPF network of MPLS-VPN provider. 










Correct Answer: AB




QUESTION 200
What is the proper MP-BGP configuration between the shown PE routers to implement MPLS VPNs on PER2?






A. None of the above 
B. router bgp 1 neighbor 50.0.0.4 remote-as 1 neighbor 50.0.0.4 update-source Loopback0 no auto-summary ! address-family ipv4 neighbor 50.0.0.4 activate
neighbor 50.0.0.4 send-community extended exit-address-family 
C. router bgp 1 neighbor 50.0.0.4 remote-as 1 neighbor 50.0.0.4 update-source Loopback0 no auto-summary ! address-family vpnv4 neighbor 50.0.0.4 activate
neighbor 50.0.0.4 send-community extended exit-address-family 
D. router bgp 1 neighbor 50.0.0.4 remote-as 1 neighbor 50.0.0.4 update-source Loopback0 no auto-summary ! address-family vpnv4 unicast multicast neighbor
50.0.0.4 activate neighbor 50.0.0.4 send-community extended exit-address-family 









Correct Answer: C





QUESTION 201

Refer to the exhibit. 





The exhibit illustrates the exchange of VPN route and label information between MPLS VPN inter- AS. The exhibit also shows ASBRs exchanging VPN-IPv4
addresses. 
Which command is needed to change the next-hop address when ASBR2 is not configured? 
A. Redistribute command with the BGP routing process 
B. Redistribute command with connected 
C. Redistribute command with the IGP routing process 
D. Redistribute command with static 












Correct Answer: B




QUESTION 202
When configuring Multicast VPN (MVPN) over an MPLS core, both the Default and Data MDT is configured under which configuration mode? 
A. router(config-router)# 
B. router(config)# 
C. router(config-router-af)# 
D. router(config-if)# 
E. router(config-vrf)# 







Correct Answer: E



QUESTION 203
In Multicast VPN (MVPN) implementations, which two of the following statements are regarding the Default MDT Group? (Choose two). 
A. It is used for PIM control traffic. 
B. It is optionally configured for a high bandwidth multicast source to reduce multicast traffic replication to uninterested PE routers. 
C. Within the VRF configuration in the PE router, multiple Default MDT groups are configured so each VRF can support multiple multicast sources. 
D. There is a reduced multicast state in the MPLS core P routers. 
E. When multicast traffic exceeds a certain configured threshold, traffic from the Data MDT is switched to the Default MDT to conserve bandwidth. 









Correct Answer: AD



QUESTION 204
In relation to MPLS Multicast VPN, which three statements about multicast distribution (MDT) groups are true? (Choose three) 

A. Default MDT groups are used for PIM control traffic, low-bandwidth sources, and flooding of sparse mode traffic. 
B. MDTs are built in customer networks 
C. Data MDT groups are used for high-bandwidth sources to reduce replication to uninterested PEs. 
D. MDTs are built in provider networks 
E. The number of MDTs depends on PIM modes of MDT groups. 









Correct Answer: CDE




QUESTION 205
Which statement about multicast VPN is true? 
A. The MDT group address should be the same for both address families in the same VRF. 
B. The MDT group address should be the same for both address families in the different VRFs. 
C. Configuration of the MDT source on a pre-VRF basis is supported only on IPv6. 
D. The MDT group address should be different for both address families in the same VRF. 











Correct Answer: A




QUESTION 206

Which statement about the use of Route Target Rewrite is true? 
A. It is mainly used in Intra-AS MPLS VPN deployments and is configured at the ASBR to avoid misconfiguration of the Route Target assignment for VPN
configurations. 
B. It is mainly used in Inter-AS MPLS VPN deployments and is configured at the ASBR to avoid misconfiguration of the Route Target assignment for VPN
configurations. 
C. It is mainly used in Intra-AS MPLS VPN deployments and is configured at the Router Reflector to avoid misconfiguration in Route Target assignment for VPN
configurations 

D. It is mainly used in Inter-AS MPLS VPN deployments and is configured at the Router Reflector to avoid misconfiguration of the Route Target assignment for
VPN configurations 
E. It is mainly used in Inter-AS MPLS VPN deployments and is configured at the PE router to avoid to misconfiguration of the Route Target assignment for VPN
configurations 










Correct Answer: B



QUESTION 207

Which statements about the Route Target Rewrite feature are not true? (Choose two.) 
A. After the route target replacement policy is applied to the target router, the BGP session need not be refreshed manually to put the policy into operation. 
B. Route Target Rewrite allows the administration of the routing policy to stay local to the AS. 
C. Route target replacement is always done by the ASBR. 
D. Route target rewrites are supported for VRF export maps. 
E. Route target replacement can be done on incoming and outgoing BGP updates. 










Correct Answer: AC



QUESTION 208

Which statement about implementing the Cisco IPv6 provider Edge Router over MPLS is true? 
A. 6PE feature is supported over tunnels other than RSVP-TE tunnels. 
B. Core MPLS routers are supporting IPv6 only. 
C. 6PE feature is not supported over tunnels other than RSVP-TE tunnels. 
D. Core MPLS routers are supporting IPv4 only. 









Correct Answer: C



QUESTION 209

Assume that the PEs are separated by Multiple P routers. How many labels should the ingress PE push for 6PE functionality? 
A. 1 
B. None 
C. 3 
D. 2 
E. It depends on the numbers of hops between the ingress and egress PE. 








Correct Answer: D



QUESTION 210

Which option describes a benefits of IPv6 VPN Provider Edge? 
A. Provider support for intra-AS and CSC scenarios 
B. Uses separate signaling plane, which provides more security than IPv4 
C. BGP is the preferred routing protocol for connecting two SPs. 
D. No requirement for a separate signaling plane 







Correct Answer: D






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