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07
Exo 1
1
49 = 0b0011 0001
83 = 0b0101 0001
97 = 0b0110 0001
99 = 0b0110 0011le plus long masque utilisable est donc 1111 1111.1111 1111.1000 0000.0000 0000,
ie /17.
L’adresse de sous réseau est 3.3.0.0 et son broadcast est 3.3.27.255
2
a)
(X3, X4) est supprimé avec STP. X3 est bloqué, X4 est désigné
b)
Messages:
1 |
2 |
3 |
|
|---|---|---|---|
DHCP disc |
X |
X |
X |
DHCP offer |
X |
X |
X |
DHCP Req |
X |
X |
X |
DHCP Rep |
X |
X |
|
Req ARP (A \(\rightarrow\) Y) |
X |
X |
|
Rep ARP |
X |
X |
|
ICMP echo Req |
X |
X |
|
ICMP echo rep |
X |
X |
Ethernet |
IP |
|||||
|---|---|---|---|---|---|---|
Adresses Mac |
Type |
Adresses IP |
Protocole |
TTL |
||
Source |
Destination |
Source |
Destination |
|||
Point d’observation 2 |
||||||
A1 |
FF:FF:FF:FF:FF:FF |
0x0800 |
0.0.0.0 |
255.255.255.255 |
17 |
64 |
D1 |
FF:FF:FF:FF:FF:FF |
0x0800 |
3.3.99.2 |
255.255.255.255 |
17 |
64 |
A1 |
FF:FF:FF:FF:FF:FF |
0x0800 |
0.0.0.0 |
255.255.255.255 |
17 |
64 |
D1 |
FF:FF:FF:FF:FF:FF |
0x0800 |
3.3.99.2 |
255.255.255.255 |
17 |
64 |
A1 |
FF:FF:FF:FF:FF:FF |
0x0806 |
- |
- |
- |
- |
Y1 |
A1 |
0x0806 |
- |
- |
- |
- |
A1 |
Y1 |
0x0806 |
3.3.81.2 |
7.7.8.88 |
1 |
64 |
Y1 |
A1 |
0x0806 |
7.7.8.88 |
3.3.81.2 |
1 |
63 |
Point d’observation 3 |
||||||
A1 |
FF:FF:FF:FF:FF:FF |
0x0800 |
0.0.0.0 |
255.255.255.255 |
17 |
64 |
D1 |
FF:FF:FF:FF:FF:FF |
0x0800 |
3.3.99.2 |
255.255.255.255 |
17 |
64 |
A1 |
FF:FF:FF:FF:FF:FF |
0x0800 |
0.0.0.0 |
255.255.255.255 |
17 |
64 |
D1 |
FF:FF:FF:FF:FF:FF |
0x0800 |
3.3.99.2 |
255.255.255.255 |
17 |
64 |
A1 |
FF:FF:FF:FF:FF:FF |
0x0806 |
- |
- |
- |
- |
3
Ethernet |
IP |
|||||
|---|---|---|---|---|---|---|
Adresses Mac |
Type |
Adresses IP |
Protocole |
TTL |
||
Source |
Destination |
Source |
Destination |
|||
Point d’observation 2 |
||||||
B1 |
C1 |
0x0806 |
3.3.83.2 |
3.3.97.2 |
1 |
64 |
C1 |
D1 |
0x0806 |
3.3.97.2 |
3.3.99.2 |
1 |
64 |
Point d’observation 3 |
||||||
C1 |
D1 |
0x0806 |
3.3.97.2 |
3.3.99.2 |
1 |
64 |
D1 |
A1 |
0x0806 |
3.3.99.2 |
3.3.81.2 |
1 |
64 |
5
Ethernet |
IP |
|||||
|---|---|---|---|---|---|---|
Adresses Mac |
Type |
Adresses IP |
Protocole |
TTL |
||
Source |
Destination |
Source |
Destination |
|||
Point d’observation 4 |
||||||
X3e |
Y1 |
0x0806 |
3.3.81.2 |
7.7.8.88 |
1 |
61 |
Y1 |
X3e |
0x0806 |
7.7.8.88 |
3.3.81.2 |
1 |
63 |
Point d’observation 5 |
||||||
Y2 |
E1 |
0x0806 |
3.3.81.2 |
7.7.8.88 |
1 |
60 |
E1 |
Y2 |
0x0806 |
7.7.8.88 |
3.3.81.2 |
1 |
64 |
Exo 2
1
a
3.7.5.7
b
NAT |
Privé |
Publique |
||
|---|---|---|---|---|
Adresse IP |
Numéro de port |
Adresse IP |
Numéro de port |
|
1 |
10.1.1.1 |
5555 |
3.7.5.7 |
8888 |
2
a
PO |
Adresse IP |
Numéro de port |
||
|---|---|---|---|---|
Source |
Destination |
Source |
Destination |
|
3
NAT |
Privé |
Publique |
||
|---|---|---|---|---|
Adresse IP |
Numéro de port |
Adresse IP |
Numéro de port |
|
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