Which of the following Cisco UCS Manager identity pools contains both types of FC1 identities?
- the MAC pool
- the IP pool
- the WWNN pool
- the WWxN pool
- the WWPN pool
Of the available choices, only the Cisco Unified Computing System (UCS) WWxN identity pool contains both Fibre Channel-Layer 2 (FC1) identities. This is because WWxN identity pools are a combination of World Wide Name (WWN) types: the World Wide Port Name (WWPN) and the World Wide Node Name (WWNN). Unlike other networking technologies, Fibre Channel (FC) does not make use of the Open Systems Interconnection (OSI) network model. Instead, FC uses the FC-Layers model, which is broken out in the following fashion:
– FC4: Protocol mapping layer
– FC3: Common services layer
– FC2: Network layer
– FC1: Data link layer
– FC0: Physical layer
FC0, FC1, and FC2 have similar names and functions to their OSI model equivalents, which are Layer 1, Layer 2, and Layer 3, respectively. FC3 is equivalent to the OSI model’s Transport layer, or Layer 4. FC4, on the other hand, is similar in function to a combination of all three top layers of the OSI model, which are the Session layer (Layer 5), the Presentation layer (Layer 6), and the Application layer (Layer 7).
WWNNs are 64-bit globally unique identifiers that specify a given FC node. These identifiers are typically used to assign FC1 addresses in storage area network (SAN) routing. Similar to the WWNN identity pool, the WWPN identity pool contains globally unique 64-bit identifiers that are used to assign FC1 addresses. However, WWPNs represent a specific FC port, not an entire node.
Media Access Control (MAC) identity pools contain MAC addresses, which are OSI Layer 2 48-bit hexadecimal addresses that are typically burned into a network interface card (NIC). The first 24 bits of a MAC address represent the Organizationally Unique Identifier (OUI), which is a value that is assigned by the Institute of Electrical and Electronics Engineers (IEEE). The OUI identifies the NIC’s manufacturer. The last 24 bits of a MAC address uniquely identify a specific NIC constructed by the manufacturer. This value is almost always an identifier that the manufacturer has never before used in combination with the OUI.
Internet Protocol (IP) identity pools contain IP addresses, which are 32-bit decimal addresses that are assigned to OSI Layer 3 interfaces. In a Cisco UCS domain, IP pools are typically used to assign one or more management IP addresses to each server’s Cisco Integrated Management Controller (IMC).