| meijin 2003-04-29, 11:20 am |
| Since I know some of you folks have a much stronger telecom background than I do, I thought I would cross post this here.
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I was working on an internal company pre-test on ATM and there were several questions that I was not sure about or that I could not find the answers to. Any of you ATM gurus here want to take a shot and help me out?
Here they are:
#1. The ATM Forum defines which service category as "best effort"? **
Choice 1 Real-Time Variable Bit Rate (rt-VBR)
Choice 2 Available Bit Rate (ABR)
Choice 3 Constant Bit Rate (CBR)
Choice 4 Unspecified Bit Rate (UBR)
Choice 5 Non-real-time Variable Bit Rate (nrt-VBR)
#2. You have installed an ATM switch with 16 ports each at 155 megabits per second (Mbps). **
To be considered nonblocking, the switch described above requires how much aggregate throughput?
Choice 1 About 155 megabits per second (Mbps)
Choice 2 About 622 megabits per second (Mbps)
Choice 3 About 1.2 gigabits per second (Gbps)
Choice 4 About 2.5 gigabits per second (Gbps)
Choice 5 About 9.9 gigabits per second (Gbps)
#3. Which one of the following Service Categories provides guarantees for Loss, Bandwidth, and Feedback Control? **
Choice 1 Unspecified Bit Rate (UBR)
Choice 2 Real-Time Variable Bit Rate (rt-VBR)
Choice 3 Available Bit Rate (ABR)
Choice 4 Non-real-time Variable Bit Rate (nrt-VBR)
Choice 5 Constant Bit Rate (CBR)
#4. An ATM-capable router that manages the traffic between two separate emulated or virtual LANs supports how many instances of the LEC, one for each emulated LAN? **
Choice 1 1
Choice 2 2
Choice 3 3
Choice 4 4
Choice 5 6
#5. In which layer is the Segmentation & Reassembly Sublayer found? **
Choice 1 Application Layer
Choice 2 User Layer
Choice 3 Physical Layer
Choice 4 ATM Layer
Choice 5 ATM Adaptation Layer
#6. Which one of the following PHY levels does the ATM layer use? **
Choice 1 Digital Section
Choice 2 Transmission Convergence
Choice 3 Regenerator Section
Choice 4 Analog Section
Choice 5 Physical Medium Dependent Sublayer
#7. Approved by the ATM Forum in 1997, Inverse Multiplexing over ATM (IMA) falls into which one of the following standards? **
Choice 1 User-to-Network Interface (UNI) standard
Choice 2 Signaling guidelines for Classical IP standard
Choice 3 Network-to-Network Interface (NNI) standard
Choice 4 Broadband Integrated Services Digital Network (BISDN) standard
Choice 5 Private Network-to-Network Interface (P-NNI) Phase 1 standard
#8. In LANE operation, after the LEC obtains the LES address, the LEC optionally clears the connection to the LECS, sets up the control-direct VCC to the LES, and sends what message on that VCC? **
Choice 1 LE_CONFIGURE_REQUEST
Choice 2 LE_ARP_REQUEST
Choice 3 LE_JOIN_RESPONSE
Choice 4 LE_JOIN_REQUEST
Choice 5 LE_CONFIGURE_RESPONSE
#9. Bandwidth and buffer resources must be made available on a per-connection basis at all times.
Based on the above, to which one of the following sets of guaranteed-QoS service classes must these resources be made available? **
Choice 1 CBR, nrt-VBR, and rt-VBR
Choice 2 ABR, CBR
Choice 3 UBR, nrt-VBR, and rt-VBR
Choice 4 ABR, UBR
Choice 5 ABR, nrt-VBR, and rt-VBR
#10. The User-to-Network Interface (UNI) contains header fields that are NOT contained in the Network-to-Network Interface (NNI). **
Referring to the above, which one of the following header fields is contained in the UNI, but NOT in the NNI?
Choice 1 Payload Type ID
Choice 2 Virtual Path Identifier
Choice 3 Virtual Channel Identifier
Choice 4 Header Error Control
Choice 5 Generic Flow Control
Thanks for any help you can provide. |
