Digital Infrastructure T-Level

  Topologies   What is a network topology?   A topology is the arrangement of equi pment and hardware located in a network. Topologies show the arrangement of links and nodes, different ways of linking devices together and endpoints.   Examples of network topologies   Point to point – This is a very basic topology just consisting of 2 nodes and a connection between them. For example, by using 2 computers and an ethernet cable, the computers will be able to s end resources to each other . Point to point networks are simple and easy to set up, however, they lack scalability.   Star – A star topology is a centralised topology consisting of multiple nodes and a central hub/switch. Each node can send resources to the hub/switch which is then routed to the endpoint. Star topologies are capable of sustaining lots of devices and can be scaled very easily, however, the centralised device creates a single point of failure which can be catastrophic in a fault...

  DMZ     What is a DMZ ?   DMZ stands for demilitarised zone. It is a physical or logical subnet that separates a private network from an untrusted network like the internet. Services that are public facing should always be put in a DMZ such as email servers, web servers, FTP serv er s and other public facing services.     Features of a DMZ   DMZ can offer an enhanced layer of security to a network. They are segmented from the private network and firewalls control traffic in and out of it. D MZs also contain an IDS/IPS to monitor and flag threats and malicious activity. Strict access controls are also enforced in the DMZ to ensure only legitimate traffic can access the services inside. Regular security audits are performed, and logging is enabled to monitor threats inside the DMZ.     Pros of a DMZ   Increased security to the network   Controlled access   Preventing enumeration and reconnaissance   Protects agai...

 

  Network issue questions     How would you verify that the DHCP server is not running or has insufficient available IP addresses, what steps would you take to addres s these issues?   I would perform the command “ipconfig /release” and then perform the command “ipconfig /renew” afterwards. These commands would release the computer’s IP and get a new one from the DHCP server. If the computer receives an APIPA address, it shows the DHCP is not running, or it has insufficient IP addresses available.     If you find the DHCP server is not running or it has insufficient available IP addresses, what should you do?   First, if the DHCP server is not running then I would start it by logging into the admin console on the server and enabling the DHCP service. If it has insufficient available IP addresses, I will check the DHCP scope . If the scope is not large enough then I would increase the IP range, making sure to stay clear of any static IPs that may b...