Cisco CCIE Service Provider Cable Recertification Set 4

1.

Entering the command "clear cable modem reset" from the interface configuration prompt of the CLI will:

Add the specified cable modem from the station maintenance list and force it to begin a reset sequence Reset to the default value the number of hosts that can be attached to the specified cable modem Clear the specified modem from the flap-list and the flap-list history Do nothing; "clear cable modem reset" is not a valid interface command

2.

The Hold-Down Timer used in Distance Vector protocols:

Sets the time limit of how long a router may keep a packet in its buffer, if the routing protocol is in the
process of converging Determines the number of seconds a router will wait before sending another update to neighbor routers Sets a specific period for routers to neither accept or advertise a route from a destination where an originalroute was recently lost Sets a duration where routes are not accepted from the neighbor router that caused a routing loop

3.

The purpose of Administrative Distance, as used by Cisco routers, is:

To choose between routes from different routing protocols when receiving updates for the same network To identify which routing protocol forwarded the update To define the distance to the destination used in deciding the best path To be used only for administrative purposes

4.

In a Distance Vector protocol, "counting to infinity":

Calculates the time taken for a protocol to converge Checks to make sure the number of route entries do not exceed a set upper limit Counts the packets dropped during a routing loop Sets an upper limit for hop count, so that routing loops can be broken if this limit is reached Causes the router to enter an infinite loop and requires the router to be restarted

5.

For the spanning tree algorithm, a bridge builds part of its forwarding table based on:

Destination MAC addresses 802.2 headers Source MAC addresses The Ethernet type field The SNAP field

6.

If a host sends a TCP segment with the RST flag set, it means:

The receiver should send all data in the reassembly buffer to the application receiving it immediately. The receiver should reset the session. Any routers between the source and destination hosts should reset the state of the connection in theirbuffers. The receiver should make certain its send buffer is pushed onto the wire.

7.

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

8.

Host D sends a frame to Host B at the same time that Host B sends a frame to Host D. Bridging is enabled on Router 1, and the two frames collide into each other. Select the best explanation of why Host B will or will not receive the original frame from Host D:

Host B will receive the frame, since Hosts B & D are in the same VLAN. Host B will receive the frame, since Hosts B and D are in the same routing domain. Host B will not receive the frame, since Hosts B and D are in the same collision domain. Host B will not receive the frame, since Hosts B and D are in different broadcast domains. Host B will receive the frame, since Hosts B and D are in the same bridging domain.

9.

The diagram shows a collapsed L3 switched building backbone consisting of two L3 switches: W and U. Each L3 switch has a routed interface on every subnet (VLAN) in the building. There are no VLAN trunks in the
network. In other words the L3 switches are acting as native routers. There are exactly 4 client-side VLANs (subnets): a, b, c, d. There are exactly 2 server-side VLANs (subnets): x and y. There is one routed link (Subnet
e) connecting the L3 switches in the core. How many equal-cost paths to Subnet d does L3 Switch W keep in its routing table?

1 2 3 4 5

10.

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.

Cisco CCIE Service Provider Cable Recertification Set 4

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Cisco CCIE Service Provider Cable Recertification Set 4

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