Tag: ccna-rs

EIGRP Link Bundle

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Scenario: At your job, you’ve recently installed a new serial link to a neighboring site to perform equal-cost load balancing with EIGRP. However, your boss refuses to issue you another IP network for this link, and he forbids…

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NAT Extendable

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Scenario: Your NAT configuration seems to work fine but you need to create a couple of static entries so one of your internal hosts is reachable using multiple IP addresses. Let’s see what you can do! Goal: All…

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NAT Virtual Interface

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Scenario: After passing the CCNA exam you feel like you could do anything with NAT. You just started at a new job as a junior network engineer but to your surprise the router you are working on doesn’t…

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NAT Overlapping Networks

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Scenario: Fruity international has bought Juicy Corporate and is merging the companies into a new one called “Fruity Juicy”. You are the network engineer responsible for the network migration. Unfortunately both networks are using the same address space…

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Static PAT (Port Forwarding)

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Scenario: You are a trainee for a large international website covering a wide range of topics on automobiles. You are using NAT and PAT for connectivity to the Internet but you also have a number of hosts on…

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DHCP Relay

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Scenario: You used to have a DHCP server for each VLAN but this wasn’t much of a scalable solution. You decide to get rid of all the DHCP servers and install a single DHCP server in the datacenter….

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DHCP Server

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Scenario: You are a trainee and studying for your CCNA certification. Your boss asks you if you can configure a DHCP server for some wireless clients. Confident as you are you take one of your routers and start…

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IP Fragment Filtering

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Scenario: As part of the security team you are always looking for ways to improve security within the company. You heard bad things about fragmented IP packets being a security risk to your network. You decide to block…

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OSPF per Neighbor Cost

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Scenario: The local fish trading market needs your help with their OSPF network. It seems their routers are unable to change the bandwidth or cost on the interfaces so you need to use another solution to influence OSPF…

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OSPF Auto Cost Reference Bandwidth

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Scenario: The new muppet movie is almost finished. All the actresses prefer to have a dedicated internet connection in their trailers at the movie park. You configure a couple of routers with Gigabit and FastEthernet interfaces. Unfortunately OSPF…

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