The network is designed using the network address 200.100.100.0 which then is su
ID: 3705227 • Letter: T
Question
The network is designed using the network address 200.100.100.0 which then is sub-netted using 3-bits from the host address space.
The following addresses are given to solve the fill in the blanks in Questions 41 thru 47.
IP Address of node A: 200.100.100.66
Subnet Mask: 255.255.255.224
DNS IP address: 200.100.100.99
Ethernet address of node A: Mac_A
Ethernet address of Router R1 at IP address 200.100.100.65: MAC_R1
Ethernet address of Router R2 at IP address 200.100.100.34: MAC_R2
Node A is requesting a web page from the web server presented in the diagram using the following URL: http://www.gap.com
Fill in the blanks with the correct information to show TCP/IP protocols logic processed as per the given network diagram, so that the Node A can then successfully send the request to the web server after having resolved the URL to its corresponding IP address.
41. Node A has to resolve the domain name __________ using _______ server.
42. Node A generates a broadcast using __________ protocol to resolve R1’s IP address to its Ethernet address.
43.Node A then determines that NR Query must be forwarded to a router__________ at an interface with IP address___________, and the MAC address____________.
44. Router______________ then forwards the IP packet to router_________________ at an interface with IP address___________________, and the MAC address_______________.
45.Router ________________ then forwards the IP packet to the DNS server at the port________________, and the protocol________________.
46. The DNS server resolves the name query and returns resolved IP address ________________.
47.Node A can now complete the web pages request with the followings parameters:
Source TCP port number greater than: ___________________.
Destination port number: ________________________.
Source IP Address: ________________________.
Destination IP address: ____________________.
Source MAC Address: _________________________.
Destination MAC address:___________________________.
Explanation / Answer
Solutions:
41. Node A has to resolve the domain name www.gap.com using DNS server (200.100.100.99).
To resolve domain names, DNS is used. and the IP address of DNS in this example is 200.100.100.99.
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42. Node A generates a broadcast using ARP (Address Resolution Protocol) protocol to resolve R1’s IP address to its Ethernet address.
ARP is used to get physical address (MAC address) using network layer address (i.e, IP address).
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43.Node A then determines that NR Query must be forwarded to a router R1 at an interface with IP address 200.100.100.65, and the MAC address MAC_R1.
Node A should send NR query to DNS through R1. because Node A can reach DNS via R1 only.
Node A forwards the NR query to R1. R1 has IP address of 200.100.100.65 and MAC address of MAC_R1.
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44. Router R1 then forwards the IP packet to router R2 at an interface with IP address 200.100.100.34, and the MAC address MAC_R2.
After R1 recieves packet from Node A, It should be forwarded to Router R2, through which packet can reach DNS server. R2 has IP address of 200.100.100.34 and MAC address MAC_R2.
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45.Router R2 then forwards the IP packet to the DNS server at the port 53, and the protocol DNS.
Finally, R2 forwards the packet to DNS server (200.100.100.99) to port number 53. port 53 is standard port for DNS.
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46. The DNS server resolves the name query and returns resolved IP address 23.58.31.114.
23.58.31.114 is the IP address associated/mapped with www.gap.com.
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47.Node A can now complete the web pages request with the followings parameters:
Source TCP port number greater than: 1023 (because 0-1023 are well-known ports).
Destination port number: 80. (80 is standard port for Web server / HTTP)
Source IP Address: 200.100.100.66. (IP of Node A).
Destination IP address: 23.58.31.114 (IP of Web server: www.gap.com).
Source MAC Address: Mac_A. (MAC of Node A)
Destination MAC address: MAC_www.gap.com (MAC of www.gap.com web server).
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