Cisco CCIE Service Provider DSL Set 3

Question - 15 Maximum mark : - 27

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Cisco CCIE Service Provider DSL Set 3

Assume IP Videoconference station A places a 384Kb call to IP Videoconference station B and the
Workstations are transferring files back and forth between themselves during the same time period. What
Cisco feature should be used on both routers to avoid unwanted jitter and guarantee the videoconference will get enough bandwidth for the duration of the call?

Frame Relay Traffic Shaping (FRTS) with FRF.12 packet fragmentation ✘ Generic Traffic Shaping (GTS) with FECN Rate Adaptation activated ✘ Bandwidth Guarantee for Videoconferencing (BGV) ✘ Resource Reservation Protocol (RSVP) ✔ Weighted Fair Queuing (WFQ) with IP Precedence ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

An incoming frame is received by a transparent bridge. If the destination address of the frame is not present in the database, the bridge will:

Discard the frame ✘ Send out the frame on all interfaces, except on the interface where the frame originate ✘ Put the destination MAC address in the table ✘ Broadcast the frame on all interfaces ✔ None of the above ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

What mechanism enables cut-through switches to process a frame with reduced latency?

The destination address is at or near the beginning of the frame. ✘ The CRC is at the end of the frame. ✘ The CRC is at or near the beginning of the frame. ✘ The source address is at or near the beginning of the frame. ✔ The data is compressed in the middle of the frame. ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

The diagram shows a wiring closet stack of four L2 switches A1, A2, A3, and A4. A1, A2, A3, and A4 are connected in series. Switch A1 is the root switch and connects to R1 and R2. There are no loops in the wiring
closet VLAN (=subnet). The architect wants to remove X, Y, and Z, and connect A1 directly to A2, A3, and A4 in a star. Is this a good idea?

Yes, because packets from R2 to host 10.0.1.2 will take fewer L2 hops. ✘ Yes, because with A1, A2, A3, and A4 in series, link Z will become a bottleneck. ✘ No, because switch A1 will becomes a bottleneck. ✘ No, because A1 must be replaced by a L3 switch. ✔ No, because it will create a STP loop. ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

What happens to an incoming frame on a Layer 2 switch?

The switch looks for an entry in its routing table for the destination MAC address and an associated
outgoing port. ✘ The switch looks for an entry in its switching table for the destination MAC address and an associatedoutgoing port. ✘ The switch looks for an entry in its switching table for the source MAC address and an associated outgoingport. ✘ The switch looks for an entry in its routing table for the source MAC address and an associated outgoingport. ✔

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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.

When a subscriber is configured for PPPoE service, the DSL modem is usually configured as:

A basic router (RFC 1483 routing) ✘ A basic bridge (RFC 1483 bridging) ✘ A router configured for PPPoA session termination ✘ A router configured for PPPoE session origination ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

What is the purpose of the following command? virtual-template {template-number\}pre-clone {number\}

Used in a PPPoA environment, it will improve the memory utilization by decreasing the number of dynamic
interfaces created. ✘ Used in either a PPPoA or PPPoE environment, it will decrease the time needed to boot the NRP bycreating needed access interfaces before they are needed. ✘ Used in a PPPoE environment, it will increase the time needed for a user to connect to the NRP byallocating access interfaces at boot time. ✘ Used in a PPPoE environment, it will pre-create a defined number of dynamic access interfaces to reducethe load on the NRP during times of peak user logins. ✔ Used in either a PPPoA or PPPoE environment, it will increase the initial load on the NRP by pre-creating adefined number of dynamic access interfaces. ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

A Network Administrator is unable to configure a PVC with the value of 8/49. He looks at the running config and notices the following entry for the interface he is working with. What is the likely cause of the problem?interface
ATM0/0/0no ip addressatm vc-per-vp 2048no atm ilmi-keepalive

ILMI has timed out without keepalives. ✘ The config is fine; the NSP must be the source of the problem. ✘ An IP address is required to turn up PVCs. ✘ The interface is shutdown. ✔ Too many bits have been assigned to the VCs reducing the possible values of the VP. ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

10.

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.

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Cisco CCIE Service Provider DSL Set 3

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