An internal firewall, also known as an internal network firewall or a segment firewall, is a security system designed to protect and control traffic between different segments within an organization’s
![](https://barisyuksel.com.tr/wp-content/uploads/2024/05/forti_dmz.png)
What is DMZ (Demilitarized Zone)? A DMZ (Demilitarized Zone) in computer networking refers to a physical or logical subnetwork that contains and exposes an organization’s external-facing services to an untrusted
![](https://barisyuksel.com.tr/wp-content/uploads/2024/05/gre_tunnel_feature.png)
A GRE (Generic Routing Encapsulation) tunnel in Cisco is a method of encapsulating and tunneling network traffic over an IP network. It allows the creation of a virtual point-to-point link
![](https://barisyuksel.com.tr/wp-content/uploads/2024/02/general_diagram.png)
IPsec, short for Internet Protocol Security, is a suite of protocols used to ensure secure communication over IP networks. It provides security services at the IP layer by enabling encryption,
![](https://barisyuksel.com.tr/wp-content/uploads/2024/02/ethernet_portsecurity.png)
Today we will implement port security on our Cisco switch. We will bind the MAC address of the NIC device with our related port. So if some changes happen on
![](https://barisyuksel.com.tr/wp-content/uploads/2023/12/Multiple-DHCP-server-general-diagram.png)
On this practice lab, we will configure two DHCP servers for 4 different VLANs. We will create the VLANs on the core switch, then we will assign the DHCP servers
![](https://barisyuksel.com.tr/wp-content/uploads/2023/10/cisco_asa_transparent_firewall.png)
Cisco ASA (Adaptive Security Appliance) is a security device that provides firewall, VPN, and other security services for networks. It can operate in multiple modes, including Routed Mode and Transparent
![](https://barisyuksel.com.tr/wp-content/uploads/2023/10/fortigate_failover_Ad.jpg)
On our topology, we have Fortigate firewall, Cisco routers and 2 ISP provider with 20.0.0.2 and 10.0.0.2 gateways. We would like to setup a basic failover on Fortigate firewall which
![](https://barisyuksel.com.tr/wp-content/uploads/2023/10/cisco_router_jpg.jpg)
What is Cisco Rommon Mode? ROM Monitor Mode, often referred to as “ROMMON” mode, is a low-level mode on Cisco networking devices that allows for basic device recovery and maintenance