Protocol A2 is captured in sequence from Lines 11 to 13. Refer to the figure below.

Figure 7: A TCP/IP Protocol Stack

A2

Data

1) Complete the protocol stack in Figure 7.

2) Verify the state of the application process using the conversation tracking numbers.

Figure 6 shows a Wireshark capture. Destination Protocol No. Time Source 1 0.000000 192.168.23.55 100.168.0.4 TI 2 0.001695 100.168.0.4 192.168.23.55 T1 3 0.001739 192.168.23.55 100.168.0.4 TI 4 0.013040 0.150243 192.168.23.55 100.168.0.4 100.168.0.4 192.168.23.55 A1 Al 5 6 0.150351 192.168.14.16 100.168.0.4 P1 ARP 7 0.150496 Barca_01:6e: bd Broadcast 8 0.151908 Porto_00:34:56 Silicom_01:6e:bd 9 0.152486 192.162.55.10 192.168.1.1 ARP DNS 10 0.153265 192.168.1.1 192.162.55.10 DNS Info 50678 > 23 (SYN) Seq=0 Win-32120 Len-0 MSS-1460 - 23 > 50678 [SYN, ACK) Seq=0 Ack-1 Win-17376 Len0 MSS-1448 - 50678 > 23 [ACK) Seq=1 Ack=1 Win=32120 Len=0 Al Data.. Al Data. 50678 > A1 (ACK) Seq-28 Ack=4 Win32120 Len=0. Who has 192.168.1.1? Tell 192.168.1.2 192.168.1.1 is at 00:30:54:00:34:56 Standard query Oxedd4 A ftp.ecitele.com Standard query response Oxedd4 CNAME dns.prime.com A 147.234.1.253 ghetto > 25 [SYN] Seq=0 Win-16384 Len-0 MSS-1460 - 25 > ghetto (SYN, ACK) Sequo Ack-1 Win-25398 Len=0. ghetto > 25 [ACK] Seq=1 Ack=1 win=16932 Len=0 Standard query Oxbdd5 SRV_sip._udp.sip.cybercity.dk Request: REGISTER sip:sip.fullamark.in Status: 401 Unauthorized (0 bindings) Echo (ping) request (id=0x0200, seg(be/le)-230479 ttl=128) Echo (ping) reply (id=0x0200, seg(be/le) 2304/9 ttl=128) Echo (ping) request (id=0x0200, seg(be/le) -2560/10 ttl=128) Echo (ping) reply (id=0x0200, seq(be/le) 2304/9 ttl=128) 11 0.154151 192.162.55.10 147.234.1.244 A2 12 0.154822 147.234.1.244 192.162.55.10 A2 147.234.1.244 A2 14 192.162.55.10 DNS 13 0.155600 192.162.55.10 0.156489 192.168.1.1 15 0.157157 192.162.55.10 0.157936 212.242.33.35 0.158714 192.162.55.10 212.242.33.35 SIP 16 192.162.55.10 SIP 17 192.168.1.1 NI 18 0.159493 192.168.1.1 192.162.55.10 N1 19 0.160211 192.162.55.10 192.168.1.1 NI 20 0.161087 192.168.1.1 192.162.55.10 NI Figure 6: A Wireshark capture