· 7 years ago · Jul 09, 2018, 12:54 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
43= 46 x 10^5
44= 4600000 meter
45= 4600 km
46
47
48Question 3
49
50seq - 7261 ack-1162
51seq - 1162 ack-8721
52seq - 8721 ack-1162
53seq - 8282 ack-2806
54seq - 9742 ack-2806
55seq - 0 ack-2777995865
56seq - 0 ack-1
57seq - 2806 ack-10075
58seq - 1162 ack-8825
59
60
61Question 4
62
63ip nat inside source static 192.168.1.11 11.11.100.125
64ip nat inside source static 192.168.1.12 11.11.100.124
65
66ip nat inside source static 192.168.1.12 23 11.11.100.123 23
67ip nat inside source static 192.168.1.11 80 11.11.100.123 80
68
69access-list 20 permit host 192.168.1.13
70access-list 20 permit host 192.168.1.14
71
72Question 5
73
74ICMP Request Subnet 01 172.16.1.254 11.11.11.11
75ICMP Request Subnet 04 200.200.200.200 11.11.11.11
76ICMP Request Subnet 06 50.50.50.50 11.11.11.11
77ICMP Request Subnet 08 11.11.11.254 11.11.11.11
78ICMP Reply Subnet 08 11.11.11.11 172.16.1.2
79ICMP Reply Subnet 03 100.100.100.101 172.16.1.2
80ICMP Reply Subnet 01 172.16.1.254 172.16.1.2
81
82Question 6
83
84192.168.12.4
85192.168.12.6
86192.168.12.36
87192.168.12.38
88
89Question 7
90
91Router0(config)#access-list 2 deny host 192.168.1.1
92Router0(config)#access-list 2 permit any
93Router0(config)#line vty 0 4
94Router0(config-line)#password cisco
95Router0(config-line)#login
96Router0(config-line)#access-class 2 in
97Router0(config-line)#exit