Archive for admin
Enable Passwords On Cisco Routers Via Enable Password And Enable Secret
Security is a part of every good technical administrator’s game plan. Luckily the good folks at Cisco have made the task of securitizing a Cisco router fairly straightforward in design- with support given for up to five types of passwords. Taking advantage of these passwords is vital to a network’s internal security, and should be [...]
29May2008 | admin | 2 comments | Continued
How a Broadcast Address Works
Imagine you’re Paul Revere, riding from Boston to Lexington to warn citizens that the redcoats were coming. He may not be as fast as computer networks today, but Paul Revere was essentially acting much like a broadcast would- he was relaying his message to the entire town of Lexington.
A broadcast, in particular, is a simple [...]
Dynamic Host Configuration Protocol (DHCP) Definition
Let’s imagine you’re a system administrator at a large company. You are implementing a new network of several hundred computers. All is fine and well until you realize: you have to manually input every single IP address, subnet mask, and gateway settings onto every single computer. You’re paid well, but maybe not that well.
For those [...]
An Introduction to Dynamic Host Configuration Protocol
Let’s imagine you’re a system administrator at a large company. You are implementing a new network of several hundred computers. All is fine and well until you realize: you have to manually input every single IP address, subnet mask, and gateway settings onto every single computer. You’re paid well, but maybe not that well.
For those [...]
Securing Cisco Routers with No IP Directed-Broadcast
One of several overlooked commands that can produce a world of hurt for networks is the IP Directed-broadcast command. This command was introduced in Cisco’s routers at IOS version 10. Cisco soon realized that this command was being maliciously exploited in denial of service attacks, and action had to be taken- particularly against smurf attacks.
How [...]
An Introduction to Cisco Router Configuration
Configuring a router sounds like a tough task. Routers are capable of sending and routing data on a dynamic level- no easy feat. But with this article we are only getting our feet wet. We will take a look at how we connect to a router via the console port and setup a HyperTerminal session [...]
2Feb2008 | admin | 0 comments | Continued
CCNA 1 Module 8 Exam Solutions
Cisco’s exams can be a lot of hard work- we know. But the worst thing you can do to yourself is to simply look up the answers to exam questions. Not only do you not learn anything- but you’re hurting your future in the process. Instead, shouldn’t you get a helpful hint and get pointed [...]
31Jan2008 | admin | 4 comments | Continued
An Introduction to Ethernet Switching
When you stop to think how well the internet is put together, you start to wonder how the internet coexists with all the chaos that results from broadcasts, data collision, and data loops. Yet, despite the odds, the internet is still (currently) alive and thriving today. But what can we attribute this achievement to? As [...]
31Jan2008 | admin | 3 comments | Continued
CCNA 1 Module 7 Solutions
Cisco’s exams can be a lot of hard work- we know. But the worst thing you can do to yourself is to simply look up the answers to exam questions. Not only do you not learn anything- but you’re hurting your future in the process. Instead, shouldn’t you get a helpful hint and get pointed [...]
30Jan2008 | admin | 0 comments | Continued
CCNA 1 Module 6/7 Solutions
Cisco’s exams can be a lot of hard work- we know. But the worst thing you can do to yourself is to simply look up the answers to exam questions. Not only do you not learn anything- but you’re hurting your future in the process. Instead, shouldn’t you get a helpful hint and get [...]
30Jan2008 | admin | 0 comments | Continued
