· 7 years ago · Jul 09, 2018, 12:52 PM
1/*************************************************************
2* COPY RIGHT *
3* BACHELOR OF COMPUTER SCIENCE (HONS) Year 1 Tri-semester2 *
4* DATA COMMUNICATION DISCUSSION FOR MID TERM2 *
5*************************************************************/
6
71 ADF
82 A
93 DF
104 A
115 D
126 AF
137 ACD
148 D
159 C
1610 CDF
1711 D
1812 A
1913 BCE
2014 ABD
2115 AEF
2216 B
2317 BEF
2418 D
2519 BDE
2620 DF
2721 C
2822 D
2923 BC
3024 ADE
3125 AD
32
33Question 1
34(1) DHCP range wrong, if there are 55 users then the last ip will clash with TFTP server
35(2) NAT for Public webserver points to the wrong address, it points to the DHCP server instead of
36 the Web Server
37(3) NAT for TFTP Server uses TCP, while TFTP uses UDP
38(4) No NAT for Public DNS Server, there is no NAT to allow any access to Public DNS server
39
40
41Question 2
420.023 x 2 x 10^8 meter = 4 600 000
43
44
45Question 3
46
47seq - 7261 ack-1162
48seq - 1162 ack-8721
49seq - 1266 ack-8721
50seq - 3710 ack-8282
51seq - 4043 ack-8282
52seq - 0 ack-0
53seq - 0 ack-1
54seq - 8282 ack-4376
55seq - 8721 ack-1824
56
57WAI WENG's ANSWER
58seq - 7261 ack-1162
59seq - 1162 ack-8721
60seq - 8721 ack-1162
61seq - 8282 ack-2806
62seq - 9742 ack-2806
63seq - 0 ack-2777995865
64seq - 0 ack-1
65seq - 2806 ack-10075
66seq - 1162 ack-8825
67
68RICHIE'S ANSWER
69seq - 7261 ack -1162
70seq - 1162 ack -5801
71seq - 8721 ack -1162
72seq - 8282 ack -2250
73seq - 9742 ack -2250
74seq - 0 ack -2777995865
75seq - 0 ack -1
76seq - 2250 ack -10075
77seq - 1162 ack -7365
78
79
80
81Question 4
82
83ip nat inside source static 192.168.1.11 11.11.100.125
84ip nat inside source static 192.168.1.12 11.11.100.124
85
86ip nat inside source static 192.168.1.12 23 11.11.100.123 23
87ip nat inside source static 192.168.1.11 80 11.11.100.123 80
88
89access-list 20 permit host 192.168.1.13
90access-list 20 permit host 192.168.1.14
91
92Question 5
93
94ICMP Request Subnet 01 172.16.1.254 11.11.11.11
95ICMP Request Subnet 04 200.200.200.200 11.11.11.11
96ICMP Request Subnet 06 50.50.50.50 11.11.11.11
97ICMP Request Subnet 08 11.11.11.254 11.11.11.11
98ICMP Reply Subnet 08 11.11.11.11 172.16.1.2
99ICMP Reply Subnet 03 100.100.100.101 172.16.1.2
100ICMP Reply Subnet 01 172.16.1.254 172.16.1.2
101
102Question 6
103
104192.168.12.4
105192.168.12.6
106192.168.12.36
107192.168.12.38
108
109Question 7
110
111Router0(config)#access-list 2 deny host 192.168.1.1
112Router0(config)#access-list 2 permit any
113Router0(config)#line vty 0 4
114Router0(config-line)#password cisco
115Router0(config-line)#login
116Router0(config-line)#access-class 2 in
117Router0(config-line)#exit