Chapter 3


1

List the functions provided by bit-level encoding schemes.

Answer:

Clocking, DC balance, bit error detection and byte/word alignment.

2

What must be subtracted from the data bit rate to determine the ULP throughput rate?

Answer:

Inter-frame spacing and framing overhead.

3

List the six physical topologies.

Answer:

Star, linear, circular, tree, partial mesh and full mesh.

4

How can a protocol that is not designed to operate in a circular physical topology overcome this limitation?

Answer:

By implementing special procedures or protocols that create a non-circular logical topology.

5

Describe one situation in which service and device discovery is not required.

Answer:

Either of the following is correct: when a human learns of the service/device name or address via some non-computerized method or when a device has been manually configured.

6

What additional steps might be required after service/device discovery?

Answer:

Name and/or address resolution depending on the contents of the discovery reply.

7

How many ULPs was the SPI designed to support? List them.

Answer:

One; SCSI.

8

During which SPI bus phases is the data bus used?

Answer:

COMMAND, DATA, STATUS and MESSAGE.

9

Why does the SPI device discovery mechanism not scale?

Answer:

Each address in the address space must be probed.

10

What SCSI command enables the discovery of LUNs?

Answer:

REPORT LUNS.

11

Ethernet originally competed against what network technologies?

Answer:

Primarily ARCNET and Token Ring.

12

What assumption enables Ethernet to remain a low-overhead protocol?

Answer:

That ULPs will provide the required functionality that is missing from Ethernet.

13

What logical topology is supported by Ethernet?

Answer:

Tree.

14

List three characteristics that contributed to the early success of TCP/IP.

Answer:

Emphasis on human community, abstraction through layered protocols and open dialogue about future developments.

15

What is the ULP throughput rate of iSCSI on GE?

Answer:

918.075 Mbps.

16

What iSCSI command enables the discovery of target nodes?

Answer:

SendTargets.

17

What two protocols are available for automated discovery of iSCSI target devices and nodes?

Answer:

SLP and iSNS.

18

Did FC evolve into a multi-protocol transport, or was it designed as such from the beginning?

Answer:

FC was designed to be multi-protocol from the beginning.

19

What is the ULP throughput rate of FCP on one Gbps FC?

Answer:

826.519 Mbps.

20

FC protocol operations are defined for what topologies?

Answer:

PTP, loop and switch based (fabric).

21

FC device discovery can be bounded by what mechanism?

Answer:

Zoning.




Storage Networking Protocol Fundamentals
Storage Networking Protocol Fundamentals (Vol 2)
ISBN: 1587051605
EAN: 2147483647
Year: 2007
Pages: 196
Authors: James Long

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