URGENT!!!!!!!!! PLEASE ANSWER ALL FOUR FOUR (4) QUESTIONS BELOW: 1) Assume a fiv
ID: 3669189 • Letter: U
Question
URGENT!!!!!!!!! PLEASE ANSWER ALL FOUR FOUR (4) QUESTIONS BELOW:
1)
Assume a five layer TCP/IP model as shown in the class notes. The initial data at the application layer is 170 bytes. A 50 byte header is added at each of the transport, network, and data link layers. The data link layer trailer is 10 bytes. What are the total bytes sent to the hardware? In percentages, what is the overhead?In percentages, what is the portion of the total bytes sent that is data? Show your work to get full credit.
2)
) Go to http://www.rfc-editor.org to look at a couple of Requests for Comment (RFC).
Look up RFC 791, Internet Protocol (IP). Look at the IP header. List each field in the header. (You do not have to explain them, just list them).
Describe the “Time to Live” field found in the header.
3)
A byte is 8 binary bits.
What is the smallest unsigned decimal number that can be represented by one byte?
What is the largest unsigneddecimal number that can be represented by one byte?
What range can be represented by one byte?
4) Convert the hexadecimal number 9A7B1 to binary =
do the logical conversion: 11111111OR 10011011=
Explanation / Answer
1. After processing the program request, the protocol on the Application layer
will talk to another protocol from the Transport layer, usually TCP. This layer is in
charge of getting data sent by the upper layer, dividing them into packets and sending
them to the layer below, Internet. Also, during data reception, this layer is in charge of putting
the packets received from the network in order (because they can be received out-of-order) and
also checking if the contents of the packets are intact.
On the Internet layer we have the IP (Internet Protocol), which gets the packets received from the
Transport layer and adds virtual address information, i.e., adds the address of the computer that is
sending data and the address of the computer that will receive this data. These virtual addresses are called IP addresses.
Then the packet is sent to the lower layer, Network Interface. On this layer packets are called datagrams.
2. RFC 791 is part of STD 5
Files- ASCII, PDF
Title- Internet Protocol
Authors- J. Postel
Date- September 1981
More Info- Obsoletes RFC 760,
Updated by RFC 1349, RFC 2474, RFC 6864, Errata.
Status- Internet Standard.
3. There are 256 different unsigned 8-bit numbers.
The smallest unsigned 8-bit number is 0 and the largest is 255.
eg: For example, 000010102 is 8+2 or 10.
4. 9A7B1 - 1001 1010 0111 1011 0001
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