Category: CCNA

Cisco Certified Network Associate certification resources

Diagram illustrating port forwarding with traffic from public IP to private web server through a router, showing port numbers and NAT configuration pathways.
CCNA October 13, 2019

Introduction to Port Forwarding including Its Configuration – Exclusive Explanation (Updated 2025)

Port forwarding is a critical networking technique that allows external devices to access services on a private network by directing traffic from a public IP address and port to a specific internal IP and port. For CCNA and CCNP students, understanding port forwarding is essential for configuring routers, securing networks, and enabling services like web […]
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Network topology diagram illustrating Port Address Translation (PAT) with multiple private IPs sharing a single public IP address through router R2, including hosts PC-1 and Laptop0 connecting to a web server via R1.
CCNA October 13, 2019

How to Configure Port Address Translation (PAT)

Port Address Translation (PAT), also known as NAT overload, is a cornerstone of IP connectivity for CCNA students and essential for conserving IPv4 addresses in real-world deployments. In the CCNA 200-301 exam (IP Services domain), you’ll configure PAT to map multiple private inside local addresses (e.g., 192.168.x.x) to a single public inside global address, enabling […]
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Cisco router R1 performing dynamic NAT translation between public internet and private LAN 192.168.0.0/16 using inside global IPv4 pool 202.128.54.0/28
CCNA October 12, 2019

How to Configure Dynamic NAT (Updated 2025)

Dynamic Network Address Translation (NAT) is a cornerstone of modern networking, allowing multiple private IP devices to share a limited pool of public IPs for internet access. Unlike static NAT, dynamic NAT automatically maps inside local addresses to a pool of inside global addresses on a first-come, first-served basis—ideal for scenarios with more internal hosts […]
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CCNA October 11, 2019

Master how to configure Static NAT on Cisco Routers? (Updated 2025)

Static NAT maps inside and outside addresses one-to-one. It allows external devices to establish a session with internal devices using the statically assigned public address. For example, an internal web server is mapped to a specific inside global address. The figure below illustrates an inside network containing a web server with a private IPv4 address […]
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NAT Advantages and disadvantages
CCNA October 10, 2019

NAT Advantages and Disadvantages (Updated 2025

Network Address Translation (NAT) is a crucial topic in Cisco’s CCNA and CCNP curricula. It helps conserve IPv4 addresses and enhances security in enterprise networks. In this article, we’ll explore the pros and cons of NAT, with practical examples and tips for your certification exams. Network Address Translation (NAT) is a method used in IP […]
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"Network diagram showing NAT translation with router R1 converting inside local IPs to global IPs for accessing external servers like Wordpress.org
CCNA October 10, 2019

What are the types of NAT translation? Exclusive Guide (Updated 2025)

There are three main types of NAT translation: static NAT, dynamic NAT, and port address translation (PAT). This guide is tailored for CCNA (200-301) and CCNP (ENCOR & ENARSI) students, with full Cisco IOS configurations, packet walk-throughs, verification commands, and troubleshooting tips. Static NAT Static NAT translation is also known as one-to-one NAT. Static NAT […]
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NAT terminology diagram showing inside local 192.168.1.100 translated to inside global 172.35.10.2 with outside local 20.41.5.19 and outside global 209.165.201.1
CCNA October 9, 2019

NAT Terminology Explained: CCNA 200-301 Must-Know Address Types

As discussed before, NAT translates private IP addresses into public IP addresses. So in the process of translation, there are different operations involved, and understanding each of them requires understanding NAT terminology. Therefore, before understanding NAT in detail, it is important to understand basic NAT terminology. In NAT terminology, the inside network is the set […]
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Stateful DHCPv6 topology showing server on G0/1 assigning 2001:ABCD:1:B::/64 prefix to client
CCNA October 6, 2019

How to Configure Stateful DHCPv6 Server

We can configure the stateful DHCPv6 server, similar to a stateless server. The difference between stateless and stateful is that a stateful server also includes IPv6 addressing information similar to a DHCPv4 server and obtains the state of the DHCP. Similar to stateless DHCPv6, we need to enable unicast routing. The command ipv6 unicast-routing enables […]
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