Media Access Control (Mac) Address; Network-Layer Address; Ip Addresses - 3Com 4007 Implementation Manual

360 C 16: IP R
HAPTER
Media Access Control
(MAC) Address
Network-Layer
Address

IP Addresses

OUTING
If you define multiple interfaces for an IP VLAN, you cannot subsequently
modify that IP VLAN to supply Layer 3 address information. If only one
routing interface is defined for the IP VLAN, then you can supply Layer 3
address information as long as it matches the Layer 3 information
specified for the routing interface. This latter procedure is not
recommended, since it makes the IP VLAN a network-based VLAN.
If you continue to use network-based VLANs for this release, you are
limited to defining only one IP routing interface for that VLAN. When you
define an IP routing interface for a static VLAN already configured, the
module will not allow you to select a network-based IP VLAN that already
has a routing interface defined for it.
The MAC address refers to a physical hardware address. On a LAN, the
MAC address is the unique hardware number of your device. The MAC
address on an Ethernet LAN is the same as your Ethernet address.
The network-layer address refers to a logical address that applies to a
specific protocol. A network-layer address exists at Layer 3 of the
OSI reference model.
IP addresses are 32-bit addresses that consist of a network part (the
address of the network where the host is located) and a host part (the
address of the host on that network).
Figure 33 IP Address: Network Part and Host Part
IP Address
network
The boundary between network
IP addresses differ from Ethernet and Fiber Distributed Data Interface
(FDDI) MAC addresses, which are unique hardware-configured 48-bit
addresses. A central agency assigns the network part of the IP address,
and you assign the host part. All devices that are connected to the same
network share the same network part (also called the prefix).
and host parts depends on the
class of IP network.
32 bits
host