A network interface can tell a lot about the health of the network. In this video, you’ll learn about interface monitoring, CRC errors, runts, giants, drops, error disabled states, and port status messages. << Previous: Cable Issues Next Video: Hardware Issues >> Network administrators use a great deal of their time to monitor different interfaces […]

If the physical layer isn’t right, the network will have big problems. In this video, you’ll learn about fiber mismatches, cable categories, crosstalk, EMI, attenuation, and proper termination. << Previous: Network Troubleshooting Methodology Next Video: Interface Issues >> When you’re working with fiber optics, you have to make sure that you’re using exactly the right

Network professionals solve problems every day. In this video, you’ll learn how a troubleshooting methodology can simplify complex issues and make it easier to identify and solve big problems. << Previous: Security Rules Next Video: Cable Issues >> When you work with networks, there will be problems that need to be resolved and issues that

We often use rules to allow or prevent access to important resources. In this video, you’ll learn about access control lists, firewall rules, content filtering, screened subnets, and security zones. << Previous: Device Security Next Video: Network Troubleshooting Methodology >> One common way to limit the type of traffic that can traverse the network is

There are many best practices for keeping devices safe. In this video, you’ll learn about disabling ports, changing default credentials, MAC filtering, and much more << Previous: Malware Next Video: Security Rules >> There are a number of different ways to help protect our computing devices. And in this video, we’ll look at device security.

Malicious software can cause significant damage to nearly any system or network. In this video, you’ll learn about different malware types and how attackers use ransomware to encrypt data and extort users for financial gain. << Previous: Social Engineering Next Video: Device Security >> One constant challenge we have both at home and in our

Attackers often use social engineering techniques to subvert existing security controls. In this video, you’ll learn about phishing, shoulder surfing, tailgating, piggybacking, and dumpster diving. << Previous: Rogue Services Next Video: Malware >> We’ve probably all seen an email come through our inbox that seems to be from one sender, but, in reality, it’s being

Gaining access to a traffic flow can be challenging for any attacker. In this video, you’ll learn how ARP poisoning and DNS poisoning can be used to perform on-path network attacks. << Previous: ARP and DNS Poisoning Next Video: Social Engineering >> We’ve become very accustomed to connecting to a network and receiving an IP

Gaining access to a traffic flow can be challenging for any attacker. In this video, you’ll learn how ARP poisoning and DNS poisoning can be used to perform on-path network attacks. << Previous: MAC Flooding Next Video: Rogue Services >> Spoofing is a term that describes when one person or device pretends to be another

An attacker can sometimes convince a switch to send information to places it normally wouldn’t. In this video, you’ll learn how MAC flooding can be used to turn a switch into a hub. << Previous: VLAN Hopping Next Video: ARP and DNS Poisoning >> In a computer, the MAC address is the Media Access Control