Amer Networks SS3GR24i - Manual (Page 50)

SS3GR24i/SS3GR48i Layer3 Stackable Gigabit Switch User’s Guide
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End users that want to receive multicast packets must be able to
inform nearby routers that they want to become a multicast group
member of the group these packets are being sent to. The Internet
Group Management Protocol (IGMP) is used by multicast routers
to maintain multicast group membership. IGMP is also used to
Internet Group Management Protocol (IGMP)
When a new TCP/IP configuration is received from a DHCP server,
the network device checks for a possible IP address conflict by
sending an Address Resolution Protocol (ARP) request that
contains its new IP address.
If an IP address lease cannot be renewed, the network device or
computer sends a request to all local DHCP servers attempting to
renew the lease. If the DHCP returns a negative
acknowledgement, the network device must release its TCP/IP
configuration and reinitialize.
If the IP address lease expires, the network device sends a message
to the DHCP server requesting a lease renewal. The DHCP server
can send an acknowledgement containing a new lease and updated
configuration information.
Usually, it is a network policy to assign the same IP address to a
given network device or computer each time.
IP addresses are assigned from a pool of free addresses. Each IP
address assigned has a ‘lease’ and a ‘lease expiration period’. The
lease must be periodically renewed. If the lease expires, the IP
address is returned to the pool of available IP addresses.
The Dynamic Host Configuration Protocol (DHCP) is used to
dynamically assign a TCP/IP network configuration to network
devices and computers on the network. It also ensures that IP
address conflicts do not occur.
DHCP Servers