Year: 2019
CCNA October 15, 2019

What is NAT for IPv6 – Exclusive Details

NAT and private IPv4 addresses have slowed down the depletion of IPv4 addresses, but NAT has some disadvantages. The one major benefit provided by NAT is security. NAT hides the private IPv4 network from the public Internet, providing a perceived level of security by denying computers on the public Internet from accessing internal hosts. However, […]
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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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CCNA October 13, 2019

How to Configure Port Address Translation (PAT)

Port Address Translation (PAT) is also known as NAT overload. Port Address Translation preserves addresses in the inside global address pool. Port Address Translation (PAT) allows the router to simultaneously use one inside global address for several inside local addresses. We can use a single public IPv4 address for hundreds, even thousands of internal private […]
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CCNA October 12, 2019

How to Configure Dynamic NAT

Dynamic NAT maps inside local addresses to inside global addresses automatically. The inside global addresses are usually public IPv4 addresses. Dynamic NAT uses a pool of public IPv4 address or a group public IPv4 addresses for translation. Dynamic NAT also requires the configuration of the inside and outside interfaces participating in NAT like Static NAT. […]
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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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