Microsoft
Software
Hardware
Network
Question : Problem: Need help decoding ethernet frame
Can an expert review my three answers and tell me if they are correct?
What is the network ID of IP address 10.40.10.33/28?
My answer- 10.40.10.32
Use the below packet as reference for the following two questions
(a) Please complete the following tcpdump syntax:
ether[12:2] = 0x____
My answer -ether[12:2] = 0x0800
(a) What does the above value indicate?
My answer- IPv4
==========================
========
No. Time Source Destination Protocol Info
4 1.486864 15.25.48.71 16.25.180.69 IP Fragmented IP protocol (proto=UDP 0x11, off=1480)
Frame 4 (60 bytes on wire, 60 bytes captured)
Arrival Time: Sep 14, 2006 10:37:26.584297000
Time delta from previous packet: 0.204373000 seconds
Time since reference or first frame: 1.486864000 seconds
Frame Number: 4
Packet Length: 60 bytes
Capture Length: 60 bytes
Protocols in frame: eth:ip:data
Ethernet II, Src: Cisco_a1:bc:00 (00:03:fe:a1:bc:00), Dst: HewlettP_57:a7:44 (00:13:21:57:a7:44)
Destination: HewlettP_57:a7:44 (00:13:21:57:a7:44)
Source: Cisco_a1:bc:00 (00:03:fe:a1:bc:00)
Type: IP (0x0800)
Trailer: 00000000000000000000000000
0000000000
000000
Internet Protocol, Src: 15.25.48.71 (15.25.48.71), Dst: 16.25.180.69 (16.25.180.69)
Version: 4
Header length: 20 bytes
Differentiated Services Field: 0xb8 (DSCP 0x2e: Expedited Forwarding; ECN: 0x00)
1011 10.. = Differentiated Services Codepoint: Expedited Forwarding (0x2e)
.... ..0. = ECN-Capable Transport (ECT): 0
.... ...0 = ECN-CE: 0
Total Length: 25
Identification: 0x011d (285)
Flags: 0x00
0... = Reserved bit: Not set
.0.. = Don't fragment: Not set
..0. = More fragments: Not set
Fragment offset: 1480
Time to live: 116
Protocol: UDP (0x11)
Header checksum: 0x4088 [correct]
Good: True
Bad : False
Source: 15.25.48.71 (15.25.48.71)
Destination: 16.25.180.69 (16.25.180.69)
Data (5 bytes)
0000 00 13 21 57 a7 44 00 03 fe a1 bc 00 08 00 45 b8 ..!W.D........E.
0010 00 19 01 1d 00 b9 74 11 40 88 0f 19 30 47 10 19
[email protected]
..
0020 b4 45 0c 75 2b 92 d0 00 00 00 00 00 00 00 00 00 .E.u+...........
0030 00 00 00 00 00 00 00 00 00 00 00 00 ............
==========================
========
Answer : Problem: Need help decoding ethernet frame
1st correct
2nd correct
3rd correct
Random Solutions
Problem: Large RAID setup
Problem: Avaya IP Phones, Astaro Security Gateway 220, and a netgear fvs338 for IP Phone VPN
Problem: AMD Athlon XP 2600+, Asus A7V600-X and DDR400 RAM
Problem: Virtual Server 2005 guest will not receive traffic from host
Problem: Redirecting HP Laserjet 2100tn Printer to LPT1
Problem: Can't print using Apple Airport router with XP machines
Problem: Bad Processor or Memory?
Problem: How do I factory reset a GTA GB-800?
Problem: CANNOT CONFIGURE WITH EXCHANGE 2007
Problem: Refresh rate with Nokia 446x Pro 19"