CSI 345 Problems SOlution to Assignement, Fall 2011
American University of Science and Technology · Computer Networks · 2 pages · Mr. Joseph Khoury · with solution
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To be delivered Tuesday and Wednesday 10 and 11 April , print and fill in hand
written.
Fill in the ip addresses where there is IP:
1-Y@idm sends an email to x@sodetel :
A- SMTP packet goes from Y@idm PC to SMTP.IDM
Source Mac | Dest Mac
| Source IP
| Dest IP
| Source Port
| Dest
Port
|
MAcpc1
| MAcS1
| 200.5.5.1 | 200.5.5.11
| 55000
| 25
|
B- Then from SMTP.idm to SMTP.Sodetel : fill in the following: (note that you
must organize them by numbering them .
SMTP packet
Source Mac | Dest Mac
| Source IP
| Dest IP
| Source Port
| Dest
Port
|
MAcsmtp
| Macs1
| 200.5.5.11
| 193.168.0.1
| 25
| 25
|
Arp request Packet
Source Mac | Dest Mac
| Who has IP
|
|
|
|
MAcsmtp
| FF-FF-FF-FF
| 193.168.0.1
|
|
|
|
Arp reply Packet
Source Mac | Dest Mac
| Who has IP
|
|
|
|
MAsodetel
| MAcr3.2
| 193.168.0.1
|
|
|
|
DNS Packet
Source Mac | Dest Mac
| Source IP
| Dest IP
| Source Port
| Dest
Port
|
MAcsmtp
| MacS1
| 200.5.5.11
| 193.168.0.1
| 53
| 55,000
|
DNS reply packet
Source Mac | Dest Mac
| Source IP
| Dest IP
| Source Port
| Dest
Port
|
MAcr3.2
| MAcr3.1
| 193.168.0.1
| 200.5.5.11
| 55,000
| 53
|
Smtp reply packet
Source Mac | Dest Mac
| Source IP
| Dest IP
| Source Port
| Dest
Port
|
MAcr3.2
| MAcr3.1
| 193.168.0.1
| 200.5.5.11
| 25
| 25
|
C- The email now arrived at SMTP.sodetel , and then to POP.sodetel , what
happens now ?
When the email arrives at the servers the popserver is used to reply and the
smtp server is used to receive so the SMTP server will receive the email and
then the POP server will reply to the email
D- Assign an IP , SM , DG and an external DNS for PC5, also a real mac
address.
PC 5: IP address:192.168.0.1
Default gateway:192.168.1.10
Subnet mast:255.255.255.0
DNS:5.5.5.5
E- PC5 sent a request to ftp://5.5.5.5
What will be the second packet coming out of PC5 :
1-an ARP packet
-----2-a DNS packet
3-an http packet
4-an ftp packet
Justify below:
The first request coming out of pc 5 will be the arp request since the pc will
send a broadcast message to all pc finding the mac of the destination pc using
the ip address. The second request will be the DNS request to get the equivalent
ip address as a domain name.
|
F- Yahoo is replying fill in the below FTP reply packet
Source Mac | Dest Mac
| Source IP
| Dest IP
| Source Port
| Dest
Port
|
Yahoo mac
| MAcr3.1
| 5.5.5.5
| 192.168.0.1
| 53
| 55,000
|
G- The ftp reply packet is on R3 now :
Source Mac | Dest Mac
| Source IP
| Dest IP
| Source Port
| Dest
Port
|
MAcr3.2
| Macs3
| 193.168.0.1
| 192.168.0.1
| 21
| 55,000
|
H- How many collision domains exist in the first network (IDM), how many
broadcast domains ?
10 collision domains and 2 broadcast domains. |