1. why configure two DNS servers?
- A DNS can act as a primary and the other as secondary, to guarantee redundancy i resilienceif one fails.
- They can also have separate functions: one for internal names and the other for external names.
2. What is the function of the DHCP server that configure?
- Assign automatically IP addresses, subnet masks, default gateways i DNS to users’ network devices.
3. How is communication between the different networks achieved?
- Through static routesthe protocols ofrouting, which indicate how to get from one network to another.
- You need to configure them correctly router interfaces and add the routing tables necessary
4. How do we ensure that each service is available from the appropriate network?
- we use firewall rules, NAT, or simply control itIP assignment to restrict or allow access depending on the network.
5. What should we consider when configuring DNS?
- Create direct zones i reverse zones
- add records A, PTR, CNAME, etc.
- Ensure that the DNS server can be consulted from the required networks
6. What if a machine doesn’t get an IP from DHCP?
- It may be out of range
- The service is not running
- There is a disconnection between the client’s network and the DHCP server
7. How do you verify that routing works?
- making one ping between machines on different networks
- Checking routes with ip routethenetstat -rn
- making one traceroutethetracert
8. How can we identify common configuration errors?
- Check for bad IP addresses, masks and gateways configured
- Mispointed DNS
- Missing or incorrect static routes
- Ports or services not open in the firewall
9. What commands can help us during configuration?
- ping, traceroute, ipconfig/ifconfig, nslookup, you, netstat, systemctlthejournalctl