The packets listed below were received by your network's stateful firewall, and they are shown in the following table in random order. The IP addresses of two hosts in your LAN, IP1 and IP2, and two external hosts, IP3 and IP4, are assumed to be IP1 and IP2, respectively. Indicate the number of established sessions and the number of half-formed sessions by evaluating these packets. established sessions. Packet Direction Pa1 Pa2 Pa3 Pa4 Pa5 Pa6 Pa7 Pa8 Pa9 out Out in Out In In out out In Source IP IP1 IP2 IP3 IP2 IP4 IP4 IP2 IP1 IP4 Dest. IP Source Dest. Port Port 23 y X IP3 IP4 IP1 IP4 IP2 IP2 IP4 IP3 IP2 X 25 23 25 y y 80 x n y 25 25 n 23 80 SYN 1 1 1 0 1 0 1 0 1 ACK 0 1 1 1 0 1 1 1 0 The number of established sessions-2 & The number of half established sessions - 1 O The number of established sessions-0 & The number of half established sessions - 3 O The number of established sessions-2 & The number of half established sessions - 2

Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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The packets listed below were received by your network's stateful firewall, and they are
shown in the following table in random order. The IP addresses of two hosts in your
LAN, IP1 and IP2, and two external hosts, IP3 and IP4, are assumed to be IP1 and IP2,
respectively. Indicate the number of established sessions and the number of half-formed
sessions by evaluating these packets.
established sessions.
Packet Direction
Pa1
Pa2
Pa3
Pa4
Pa5
раб
Pa7
Pa8
Pa9
out
Out
in
Out
In
in
out
out
In
Source
IP
IP1
IP2
IP3
IP2
IP4
IP4
IP2
IP1
IP4
Dest. IP
IP3
IP4
IP1
IP4
O None of them
IP2
IP2
IP4
IP3
IP2
Source Dest.
Port
Port
23
X
25
23
25
y
y
80
X
n
y
X
y
25
25
n
23
80
SYN
1
1
1
0
1
0
1
0
1
ACK
0
1
1
1
0
1
1
1
0
O The number of established sessions=2 & The number of half established sessions = 1
The number of established sessions=0 & The number of half established sessions - 3
O The number of established sessions 2 & The number of half established sessions = 2
O The number of established sessions=1 & The number of half established sessions - 2
Transcribed Image Text:The packets listed below were received by your network's stateful firewall, and they are shown in the following table in random order. The IP addresses of two hosts in your LAN, IP1 and IP2, and two external hosts, IP3 and IP4, are assumed to be IP1 and IP2, respectively. Indicate the number of established sessions and the number of half-formed sessions by evaluating these packets. established sessions. Packet Direction Pa1 Pa2 Pa3 Pa4 Pa5 раб Pa7 Pa8 Pa9 out Out in Out In in out out In Source IP IP1 IP2 IP3 IP2 IP4 IP4 IP2 IP1 IP4 Dest. IP IP3 IP4 IP1 IP4 O None of them IP2 IP2 IP4 IP3 IP2 Source Dest. Port Port 23 X 25 23 25 y y 80 X n y X y 25 25 n 23 80 SYN 1 1 1 0 1 0 1 0 1 ACK 0 1 1 1 0 1 1 1 0 O The number of established sessions=2 & The number of half established sessions = 1 The number of established sessions=0 & The number of half established sessions - 3 O The number of established sessions 2 & The number of half established sessions = 2 O The number of established sessions=1 & The number of half established sessions - 2
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