Information Technology Reference
In-Depth Information
224.1.0.0-224.1.255.255
ST multicast groups
224.2.0.0-224.2.255.255
Multimedia conference calls
232.
x
.
x
.
x
VMTP transient groups
All the above addresses are listed in the domain name service under MCAST.NET and
224.IN-ADDR.ARPA. On an Ethernet or IEEE 802 network, the 23 low-order bits of the IP
multicast address are placed in the low-order 23 bits of the Ethernet or IEEE 802 net multi-
cast address.
23.13.2 Conformance
There are three levels of conformance:
•
Level 0, no IP multicasting support - in this, a Level 0 host ignores, or deletes, all Class
D addressed datagrams.
•
Level 1, sending support, but no receiving - in this, a Level 1 host can send multicast
datagrams, but cannot receive them.
•
Level 2, Full multicasting support - in this, a Level 2 host can send and receive IP multi-
casting. It also requires the implementation of the Internet group management protocol
(IGMP).
23.14 Exercises
23.14.1
Which OSI layer does the IP layer correspond to:
(a)
Data link
(b)
Network
(c)
Transport
(d)
Session
23.14.2
Which OSI layer does the TCP layer correspond to:
(a)
Data link
(b)
Network
(c)
Transport
(d)
Session
23.14.3
Which IP version do most TCP/IP hosts use:
(a)
Version 2
(b)
Version 4
(c)
Version 5
(d)
Version 6
23.14.4
How much data can be carried within an IP datagram:
(a)
64 kB
(b)
128 kB
(c)
256 kB
(d)
Unlimited
23.14.5
How many IP addresses are possible:
(a)
1 048 576
(b)
16 777 216
×
10
38
(c)
4 294 967 296
(d)
3.402 823 669
