Cisco CCIE Service Provider DSL Set 5

Question - 15 Maximum mark : - 28

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Cisco CCIE Service Provider DSL Set 5

What statement regarding Service Selection Gateway is INCORRECT?

For Proxy Service, the SSG will proxy the Access-Request to the remote AAA server. Upon receiving an
Access-Accept from the remote RADIUS server, the NRP-SSG responds to the subscriber with the Access-
Accept. ✘ Transparent passthrough service allows unauthenticated subscriber traffic to be routed through the NRP-SSG in either direction. ✘ For Proxy service, the SSG can perform NAT between the address assigned by the remote server and thesubscriber's real IP address. ✘ For non-PPP users, such as those in bridged networks, if the user disconnects from a service withoutlogging off, the connection will remain open and the user can reaccess the service without going through
logon procedure as long as the session has not timed out. ✔ The PPP Termination Aggregation (PTA) service can be used only in dialup environments and with PPPoEin DSL environments. It cannot be used with PPPoA. ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

Virtual path identifier (VPI) and virtual channel identifier (VCI) values on the NRP-2 must share ___bits. By default, VPI values are limited to ___ bits (0-15), and VCI values are limited to ___ bits (0-1023). A Network
Administrator can change the VPI and VCI ranges, but together the VPI and VCI values cannot exceed ___ bits. Which numbers below, correctly fill in the blanks?

16, 6, 10, 16 ✘ 18, 4, 12, 16 ✘ 18, 4, 8, 12 ✘ 14, 4, 10, 14 ✔ 14, 5, 9, 14 ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

An architecture that utilizes PPPoA deals with IP address allocation by what type of negotiation?

DHCP ✘ LDAP ✘ IPCP ✘ RADIUS ✔ NIS ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

According to the diagram, a PPPoE session is initiated by the user from the PC using the username johndoe@isp1.com. This PPPoE session ultimately terminates on the ISP router, using
domain based tunneling on 6400. What is the correct sequence of events which occur during user authentication?

The 6400 will query the PC to get the domain name. The 6400 will issue a PPP authentication challenge to
which the PC will respond using the username johndoe@isp1.com. Once the tunnel is established, the ISP
router will issue a challenge to the user and will authenticate the response. ✘ The 6400 will issue a PPP authentication challenge to which the PC will respond using the usernamejohndoe@isp1.com. The 6400 will authenticate the user. It will also use the domain name to find out the
tunnel endpoint. The tunnel is established and user traffic will now be allowed to flow without any further
authentication. ✘ The 6400 will issue a PPP authentication challenge to which the PC will respond using the usernamejohndoe@isp1.com. The 6400 will use the domain name isp1.com to find out the tunnel endpoint. It will
forward the authentication information to the ISP router which will authenticate the user. ✘ The 6400 will use the PVC number to decide the tunnel endpoint. Once the tunnel is established, the ISProuter will issue a challenge to the user and will authenticate the response. ✔ None of the above ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

In this network, Host A is trying to reach Host D. There is no routing protocol running, but Router B and C have the following static routes configured:Router B: ip route 10.1.3.0 255.255.255.0 ethernet 1Router C: ip route
10.1.1.0 255.255.255.0 ethernet 1

This will not work because Router B has no idea of how to forward traffic to the 10.1.3.0/24 network. ✘ This will work because Router B will recognize that Router C is on the 10.1.2.0/24 network through a routerdiscovery protocol and will forward traffic for 10.1.3.0/24 to Router C. ✘ This will not work because a broadcast interface in a static route command cannot be specified. ✘ This will work because Router B will ARP for Host D's IP address on the 10.1.2.0/24 network and Router Cwill answer. ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

Given the four networks listed, what valid summary address (below) contains the longest prefix?

10.1.0.0/20 ✘ 10.1.0.0/16 ✘ 10.1.1.0/23 ✘ 10.1.16.0/19 ✔ These networks cannot be summarized. ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

Using the shown debugging excerpt, what option best describes the problem?

An ISDN router has a misconfigured username password pair. ✘ An ISDN router is missing the stack password. ✘ The offload server does not offload calls from ISDN routers not using PPP Multilink. ✘ The offload server has a bad password. ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

What Q.931 message cannot be received in response to sending a Q.931 SETUP message?

Alerting ✘ Call Proceeding ✘ Connect ✘ USER Information ✔ Progress ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

What signaling protocol does Cisco use to provide support for MPLS traffic engineering?

RSVP ✘ LDP ✘ SS7 ✘ TDP ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

10.

What is NOT a reason to deploy MPLS?

Ubiquitous acceptance and firm standards ✘ Traffic engineering capabilities ✘ Simplify lookups in software-based routers ✘ Potential use in VPN services ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

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Cisco CCIE Service Provider DSL Set 5

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