Practice Exam Questions
653
20.
What can be determined from the following lines of a packet decode?
(Choose all that apply.)
IP Header - Internet Protocol Datagram
Version: 4 [14 Mask 0xf0]
Header Length: 5 [14 Mask 0xf]
Precedence: 0 [15 Mask 0xe0]
Type of Service: %000 [15 Mask 0x1c]
Unused: %00 [15 Mask 0x3]
Total Length: 56 [16-17]
Identifier: 2815 [18-19]
Fragmentation Flags: %000 [20 Mask 0xe0]
Fragment Offset: 0 [20-22 Mask 0x1fffff]
Time To Live: 255
IP Type: 0x01 ICMP [23]
Header Checksum: 0xe021 [24-25]
Source IP Address: 172.16.60.1 [26-29]
Dest. IP Address: 172.16.60.130 [30-33]
No Internet Datagram Options
ICMP - Internet Control Messages Protocol [34]
ICMP Type: 3 Destination Unreachable
[35]
Code: 1 Host Unreachable
Checksum: 0x6439 [36-37]
Unused (must be zero):0x00000000 [38-41]
A.
This is an SNMP packet.
B.
This is an ICMP packet.
C.
This is a type 3 ICMP packet.
D.
The source IP address is 172.16.60.130.
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