Cisco CCIE Service Provider Optical Recertification Set 3

1.

What is an Inter Switch Link (ISL)?

A protocol to interconnect switches across ATM only A protocol to interconnect switches across FDDI only An IEEE protocol to interconnect multiple switches A Cisco proprietary protocol for interconnecting multiple switches An IEEE protocol to interconnect multiple switches across Fast Ethernet

2.

Of the four types of SONET transmission equipment, what performs the 3R (Refresh/ Re-amplify, Reshape, Retime) function?

Path Terminating Equipment SONET Terminating Equipment Regenerator Add/Drop Multiplexer Digital Cross-Connect System

3.

In Frame Relay, the FECN bit is set by:

The Frame Relay network, to inform the DTE receiving the frame that congestion was experienced in the
path from source to destination The Frame Relay network, in frames traveling in the opposite direction from those frames that encounteredcongestion The receiving DTE, to inform the Frame Relay network that it is overloaded and that the switch shouldthrottle back The sending DTE, to inform the Frame Relay network that it is overloaded and that the switch should throttleback Any device that uses an extended DLCI address

4.

What is the transmission limitation on a single 1310 nm signal, at OC-192 bit-rate, over certified SMF-28 fiber using no dispersion compensation?

Four-wave mixing Polarization-mode dispersion Chromatic dispersion Attenuation

5.

In SDH an AU-4 unit is formed by:

Adding a C12 to its path overhead Adding a VC4 to a VC4 pointer Multiplexing TU12s Combining a VC3 and its VC3 pointer

6.

A router is set up to redistribute routing updates from OSPF to RIP. What answer best describes issues the network administrator needs to be aware of?

Split Horizon, Poison Reverse, Holddown Slow convergence, limited hop-count metric, lack of network mask information, periodic broadcasts None, OSPF is a link-state routing protocol which overcomes issues found in RIP. Difference in metrics (e.g. hops vs. cost), subnet mask allocation/addressing (e.g. VLSM vs. fixed subnetmask length), routing protocol summarization (e.g. network boundaries)

7.

Which three are types of payloads carried by path signal label byte C2?

0x16 scrambled POS 0x13 ATM 0x13 unscrambled POS 0xCF scrambled POS 0xCF unscrambled POS

8.

How has the MDS 9000 been engineered to promote the use of DWDM for SAN extension?

The MDS 9000 has eliminated "Fibre Channel Droop" through proxy acknowledgements of frame arrivals. The MDS 9000 has implemented buffer to buffer credits per port on the 16 port line card to allow for longdistances. The effects of Fibre Channel Droop are exaggerated and by using light amplification can be nullified. DWDM has increased available lamdas in order to simultaneously send data on a second lamda, therebyeliminating fibre channel droop.

9.

The configuration register does NOT retain settings for:

An enabled 'Break' key The console baud rate The boot method An enabled AUX port

10.

What statement about DCC tunneling in the ONS 15454 is true?

Only the first STS frame in any OC-n signal is used for tunneling. For security reasons, the 15454 randomly assigns an STS frame from within any OC-n signal to be used fortunneling. A different STS frame is used on each section of the ring, to prevent overlap or conflict on the protectionpath. Only the last STS frame in any OC-n signal is used for tunneling (this feature is also used as a bit rateindicator).

Cisco CCIE Service Provider Optical Recertification Set 3

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Cisco CCIE Service Provider Optical Recertification Set 3

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