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Subnetting

combine the material in this section with a great deal of practice and you will become an absolute subnetting surgeon. The concept of subnetting is simple enough. We’re simply  taking a block of IP addresses and cutting it up into smaller piec

Floating Static Route Lab and Originating a Default Route with RIP

This lab is based on real world networking ,where some of the hubs were in major cities but some of the spooks were rural and the networking connections were not always the best. On this occasion we would make a decision to not use a routing protocol

RIP Load Balancing , Version Mismatches and Debugging Tips

Time for us to see where load sharing can serve as a benefit as it usually does with RIP. We saw some load balancing going on and we chatted about it a little bit during our auto summarization lab and load balancing wasn’t working in our favor,

Autosummarization , Passive Interfaces & Administrative Distances

The Dangers of Autosummarization RIP did ok by us in that previous lab, but one thing we did was we turned auto summarization off because I wanted us to concentrate on other things. If we left all of those summarization on, it was going to mess up ou

Distance Vector In General, RIPv2 In Particular

Intro To Distance Vector Protocols RIP versian2 is a good way to get started with routing logic and going beyond the walkthrough as we did earlier and we will do plenty of debugging we’ll see RIP v2 in action in plenty of lab work here in the s

Static Routes, Loopbacks, Pings, And HAS Networks

There are four different kinds of static routes: “regular” static routes Host static route (“host routes”) Floating static routes )floating on what?) Default static routes This is the network we’re going to use R1 is our hub router, and the

DHCP, DNS, and ARP

The Domain Name System does something wonderful and transparent for us: It takes the hostname we enter into a web browser – usually a website’s URL – and translate it into the IP address that’s actually needed to make the communication betwee

TCP and UDP

Before we head back to L3 and start work with routing protocols, let’s take a few minutes to go into more details about the going-on at the Transport Layer(OSI Layer4). TCP and UDP get the job done here, but they do so in wildly different styles. T

Switch Stuff

Auto negotiation Ports, Ports, Ports By default, Cisco Switch ports are set to automatically negotiate port speed and duplex with the connected partner. Basically the port and the connected device have a conversation about the highest level of speed

Telnet Labs

Before we start, I’ve kept VLAN10 at 10.1.1.2/24. The default gateway and setting and everything else is the same as previous section. Telnet Running on TCP port 23, Telnet is an excellent way to logically hop around a network rather than physicall

Switches and Default Gateways

Introducing To SVI While our L2 switches don’t perform routing (they just switch and that’s all they do), we still need an IP address (a L3 address) on that switch in order to remotely connect to said switch.( we want to configure it without actu

Routing

Introduction to Routing We’ll start our walkthrough with a basic network and follow the decision-making process from the point of view of the host, then router. We’ll start with this iconfig output from our host PC. When a host sends a packet, th

IP Addresses

When one host sends data to another, that data has both a MAC destination address and an IP address and an IP  destination ( Layer 2 destination and Layer 3 destination). Up to this point we’ve been working with L2 destination addresses as opp

Port Security

The Enemies Within It’s easy to think about network security in terms of playing defense from attackers outside our network. Thing is, plenty of successful attacks have been launched from inside a network, utilizing seemingly innocent network servi

Memories, Bootups, and Securing Our Switches

Switch and Router Memory : The memory sections and functions discussed in this section are the same for switches and routers, but to avoid saying “switches and routers” 300 time, we’ll just say “switches”. Of the following, take note of whi

Trunking

Trunking Switches ( And the VLANs that love them ) Trunking  is the process of creating a logical connection between two physically connected switches, allowing frames to flow between them. As you see, Switch 1 and 2  are connected with a c

Cisco Switch Config

Naming a VLAN With  “show vlan brief” , we’ll see all VLANs that we created earlier, plus VLAN32 which I just left empty. So we have a couple of empty VLANs here. We have ports 2 and 4 in VLAN24. We can give names to VLANs specially when w

VLAN Tutorial

Why Do We Use VLAN?   Because they help us group hosts by department, security clearances, or any category, rather than being limited to geographic location. Because they are kind of a security feature and help you increase security by hidi