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I use the following table to workout the required subnet mask for my network of 62 hosts which is 255.255.255.192 which according to the table gives me 4 use-able networks.
In this case the first network address is 192.168.1.64 with a range of 65-126 and broadcast of 127.
second network: 192.168.1.128, range=129-190, broadcast=191.
third network: 192.168.1.192, range=193-254, broadcast=255.
But I don't understand the fourth network. If the table is correct it should start with 192.168.1.256 is this correct? In which case what would the range and broadcast be for this fourth network?
192.168.1.0 with a range of 1-62 and broadcast of .63 is the block you missed.
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I am reading about ipv4 and I wonder how scientist determine the perfect size of packet for example here in RFC 791 said 512 B for payload + 64 B for ip-header
how they do that?
also what parameters they considered?
Another question is that why until now this is the same as that time?? how it still working properly, even today it get smaller!
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I am not sure if this is the right platform to ask this question (does anyone of you know a community like this one where I can post questions solely related to Networking?), but can one AP have multiple bssid?
I checked the bssid of one particular AP, but it's bssid is showing different (does not match with its MAC that is there on company sticker it comes with).
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Is 255.0.255.0 a subnet mask?
If yes, then why?
The reason I thought is its a subnet mask of either class A(N.H.H.H) or class B (N.N.H.H). If there are 255 Network thrn there should be 255 hosts. Please correct me of I am wrong. I am learning the basics of computer networks
RFC 4631, ยง3.1 states that (emphasis mine)
a [subnet] prefix [...] describes the number of significant bits
So, subnet masks must be a contiguous sequence of ones, and 255.0.255.0 is not a valid subnet mask.
Note that this RFC introduced CIDR, which replaced the old style of Class A/B/C addressing.
This is a potential duplicate of https://superuser.com/questions/979915/are-subnets-always-contiguous-1s
i think it is not a subnet mask. because of my knowledge there are 255.0.0.0 for class A; 255.255.0.0 for class B; 255.255.255.0 for class C
theoretically it can be used as a subnet mask but in practical situation subnet mask have
all 1's continuously followed by all 0's. the reason why it can be theoretically be implemented because
no of 1's =NID +SID
no of 0's =HID
in practical situation it will make the computation much more complex
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I know in the ethernet header the destination address comes before the source address. Can you please explain me why is that ?
While this kind of questions is often futile (they had to pick one order; which one they choose might be random), there is indeed one very valid reason for this:
In order to work efficiently, the receiver wants to read the address of a packet very easy, perhaps even with the help of hardware (FPGA or ASIC).
And for this, it is handy to have this address at the very beginning.
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I've been asked in a assignment to analyze a packet trace and determine what kind of VNIC the user has on his or her machine. I'm finding this to be quite difficult however; I'm not quite sure what to look for. I'd appreciate getting pointed in the right direction. I mean whether the connection is through ethernet or a wireless 802.11 card
If you have the capture file with you already then open the file with wireshark, and on the display filter type "wlan", then click Apply to filter out 802.11 packets. The display filter expression for ethernet is "eth". If there are any packets on display after you apply the display filter, then there were packets that used the protocol. You can look into the packets with Wireshark to see the ethernet II or 802.11 header.
You can download some sample captures of 802.11 and Ethernet II from http://wiki.wireshark.org/SampleCaptures.
Do you mean the manufacturer of the Ethernet/WLAN card? The first 6 bytes of the Ethernet address are called the Organization Unique Identifier, and you can look them up here:
http://standards.ieee.org/regauth/oui/index.shtml