Information Technology Reference
In-Depth Information
Address Assignment and Summarization
Table 6-24
Term
Description
FLSM
A single subnet mask for the entire IP network number.
VLSM
Permits the use of different subnet masks for a network number.
Summarization
Routing protocols can aggregate subnet routes into one larger route.
CIDR
Implemented in BGP4 to aggregate network routes into a continuous
block of address space that is advertised to the rest of the Internet;
decreases the number of BGP routes to advertise.
TCP Header
Figure 6-20
0 1 2 3
01234567890123456789012345678901
Source Port
Destination Port
Sequence Number
Data
Offset
Control Bits
(Flags)
Reserved
Window Size
Checksum
Urgent Pointer
Options
Padding
Upper Layer Data
TCP Connection Protocol
Table 6-25
Protocol
Description
TCP connection establishment
A three-way handshake is performed as follows:
(1) SYN(a) sent
(2) ACK(a), SYN(b) received
(3) ACK(b) sent
Window size
Number of bytes that the receiver is willing to accept
Session termination
Four signals are sent to terminate the full-duplex connection:
(1) FIN(a) sent
(2) ACK(a) received
(3) FIN(b) received
(4) ACK(b) sent
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