101 lines
4.1 KiB
Markdown
101 lines
4.1 KiB
Markdown
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# Guide 3
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## Ex 1.5
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|Ping from:|Ping to:|Connectivity|Packets (PC1-Switch1 link)|Packets (PC3-Switch1 link)|
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|:-------:|:------------:|:---:|:----:|:---------:|
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| PC2 | Switch1 | No | ARP | N/A |
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| PC2 | PC3 | No | ARP | N/A |
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| PC2 | 192.168.1.34 | No | ARP | N/A |
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| PC3 | Switch1 | Yes | N/A | ARP, ICMP |
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| PC3 | PC2 | No | N/A | ARP |
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| PC3 | 192.168.1.34 | No | N/A | ARP |
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| Switch1 | PC3 | Yes | N/A | ICMP |
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| Switch1 | 192.168.1.34 | No | N/A | ARP |
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PCs from different vlans are unable to communicate since the switch is unable to make the connection between vlans. Neither PC1 nor PC2 can communicate with Switch1.
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- **PC2 → Switch1**
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- There's no connectivity because PC2's vlan has no configured IP;
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- **PC2 → PC3**
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- There's no connectivity because they are in different vlans;
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- **PC2 → 192.168.1.34**
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- There's no connectivity because the IP doesn't exist;
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- **PC3 → Switch1**
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- There's connectivity because they are in the same vlan;
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- **PC3 → PC2**
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- There's no connectivity because they are in different vlans;
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- **PC3 → 192.168.1.34**
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- There's no connectivity because the IP doesn't exist;
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- **Switch1 → PC3**
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- There's connectivity because they are in the same vlan;
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- **Switch1 → 192.168.1.34**
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- There's no connectivity because the IP doesn't exist;
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ARP packets occur in every new communication in the same link. ICMP packets only occur when there is connectivity through the link.
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---
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## Ex 2.2
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|Ping from:|Ping to: |Connectivity|Filtered Packets|
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|:--------:|:-------:|:----------:|:--------------:|
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| PC1 | Switch1 | Yes | N/A |
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| PC1 | Switch2 | Yes | ARP, ICMP |
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| PC1 | PC2 | No | ARP |
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| PC1 | PC3 | No | ARP |
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| PC2 | Switch1 | No | ARP |
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| PC2 | Switch2 | No | ARP |
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| PC2 | PC2 | Yes | N/A |
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| PC2 | PC3 | Yes | ARP, ICMP |
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- PC1 → Switch1
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- There's connectivity because they are in the same vlan;
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- PC1 → Switch2
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- There's connectivity because they are in the same vlan;
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- PC1 → PC2
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- There's no connectivity because they are in different vlans;
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- PC1 → PC3
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- There's no connectivity because they are in different vlans;
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- PC2 → Switch1
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- There's no connectivity because they are in different vlans;
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- PC2 → Switch2
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- There's no connectivity because they are in different vlans;
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- PC2 → PC2
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- There's connectivity because it's connecting with itself;
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- PC2 → PC3
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- There's connectivity because they are in the same vlan;
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The appearances of packets in this case is similar to the ones in Ex 1.5.
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---
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## Ex 3.5
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|Ping from:|Ping to: |Connectivity|Filtered Packets|
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|:--------:|:-----------:|:----------:|:---------:|
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| PC4 | Switch4 | No | ARP |
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| PC4 | Router | Yes | ARP, ICMP |
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| PC4 | PC5 | Yes | ARP, ICMP |
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| PC4 | 192.1.1.100 | No | ICMP |
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| PC5 | Switch4 | No | ARP, ICMP |
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| PC5 | Router | Yes | IMCP |
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| PC5 | PC4 | Yes | ICMP |
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| PC5 | 192.1.1.100 | No | ICMP |
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- PC4 → Switch4
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- There's no connectivity because they are in different vlans and there are no valid routes between them;
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- PC4 → Router
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- There's connectivity because there's a valid route between them;
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- PC4 → PC5
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- There's connectivity because, even though they are in different vlans, there's a valid route through the router
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- PC4 → 192.1.1.100
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- There's no connectivity because the destination doesn't exist;
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- PC5 → Switch4
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- There's no connectivity because they are in different vlans and there are no valid paths between them;
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- PC5 → Router
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- There's connectivity because there's a valid route between them;
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- PC5 → PC4
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- There's connectivity because, even though they are in different vlans, there's a valid route through the router
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- PC5 → 192.1.1.100
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- There's no connectivity because the destination doesn't exist;
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