Link Layer Discovery Protocol (LLDP) is an industry-standard protocol (IEEE 802.1AB) implemented by various vendors. Unlike Cisco’s proprietary CDP, LLDP is typically disabled on Cisco devices by default and requires manual enabling. It’s possible for a device to run both CDP and LLDP simultaneously, although usually, only one is utilized. LLDP messages are periodically sent […]
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CDP is a Cisco proprietary Layer 2 discovery protocol used to share information with and discover information about neighboring devices. The shared information includes hostname, IP address, device type, etc. Because this protocol shares information about devices in the network, it is considered a security risk and is often not used. CDP is enabled on
How to Configure And Verify CDP in Cisco Devices Read More »
Dynamic Host Configuration Protocol (DHCP) is a protocol used to automatically assign IP addresses to end-user devices in a network. Apart from using a dedicated server for DHCP service in a network, a Cisco router can also be used as a DHCP server. It just needs an extra bit of configuration. In this post, I
How to Configure DHCP Server on Cisco Router in Packet Tracer Read More »
In this article, we will explore how to configure PAT on a cisco router. Network address translation (NAT) is an algorithm used in translating private IP address into a public IP address for connectivity over the internet. There are two primary types of IP addresses: IPv6 and IPv4. Initially, IPv4 was the predominant addressing scheme.
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In any network, various VLANs cater to different departments within an organization. For instance, one VLAN might serve the network engineering team, while another VLAN could be dedicated to security engineering Team. These VLANs are important in segmenting the network. It ensures that access to resources is restricted within each VLAN. Even though VLANs do
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For a host to obtain an IP address from a DHCP server, it sends a DHCP request to the DHCP server on the network, and the server will reply by leasing out an IP address from the pool of available addresses to the host. DHCP clients connected to a switch are expected to transmit only
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To make forwarding decisions, switches store the MAC address associated with any interface it used to receive frames in the MAC Address table. Next time, when a frame destined to that MAC address comes in on the switch, the switch looks up the MAC address table and uses the interface associated with that MAC address
Configuring Port Security to Prevent MAC Address Table Attack Read More »
In any network setup, ensuring secure access to devices like routers and switches is paramount to prevent potential security vulnerabilities. Failure to secure access could leave networks vulnerable to unauthorized access and malicious attacks. There are two primary methods to secure access to network devices. First, we can utilize the device’s local database to store
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Securing access to network devices in real-world scenarios is of utmost importance to protect against vulnerabilities. This entails allowing only authenticated users to connect and configure these devices, either through Telnet or SSH or locally through console connections. One method to enable access security on network devices like routers or Switch is by configuring security
How to Configure TACACS+ Server in Cisco Packet Tracer Read More »
In a real-world network, securing access to network devices is of paramount importance. This measure helps safeguard the devices from vulnerabilities by permitting only authenticated users to connect and configure network devices, whether through remote connections like Telnet or SSH, or through on-site connections like console connections. One approach to enhancing access security is by
How to Configure Radius Server in Cisco Packet Tracer Read More »
