200-150 · Question #183
Which two descriptions of Fibre WWNs are true? (Choose two.)
The correct answer is B. 64 or 128 bits long E. allocated to manufactures by IEEE. Fibre Channel World Wide Names (WWNs) are 64-bit or 128-bit identifiers assigned by manufacturers under IEEE-allocated prefixes, analogous to MAC addresses in Ethernet.
Question
Which two descriptions of Fibre WWNs are true? (Choose two.)
Options
- A48bits long
- B64 or 128 bits long
- C96 bits long
- Dmanually configured on each device by an administrator
- Eallocated to manufactures by IEEE
How the community answered
(25 responses)- B92% (23)
- C4% (1)
- D4% (1)
Why each option
Fibre Channel World Wide Names (WWNs) are 64-bit or 128-bit identifiers assigned by manufacturers under IEEE-allocated prefixes, analogous to MAC addresses in Ethernet.
48 bits is the length of an Ethernet MAC address, not a Fibre Channel WWN.
WWNs are 64 bits (8 bytes) long in their standard form, with an extended 128-bit variant used in some contexts. The 64-bit length is the IEEE defined size for a World Wide Name.
96 bits is not a defined length for any standard WWN format in the Fibre Channel specification.
WWNs are factory-burned into HBAs and storage controllers by the manufacturer; administrators do not manually configure them.
Like MAC addresses, the organizationally unique identifier (OUI) portion of a WWN is allocated to hardware manufacturers by the IEEE, ensuring global uniqueness without manual administrator assignment.
Concept tested: Fibre Channel World Wide Name structure and allocation
Source: https://www.cisco.com/c/en/us/td/docs/switches/datacenter/mds9000/sw/8_x/config/san-os-nx-os/fundamentals/cisco_mds9000_fundamentals_config_guide_8x/san_port_ch.html
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