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



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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: 000000000000000000000000000000000000000000
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