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Subnetting and CIDR
Earlier in this course, you learned about network segmentation, a security technique that divides networks into sections. A private network can be segmented to protect portions of the network from the internet, which is an unsecured global network. For examp...
Proxy servers
Previously, we discussed how firewalls, VPNs, and security zones help to secure networks. Next, we'll cover how to secure internal networks with proxy servers. Proxy servers are another system that helps secure networks. The def...
Virtual networks and privacy
This section of the course covered a lot of information about network operations. You reviewed the fundamentals of network architecture and communication and can now use this knowledge as you learn how to secure networks. Securing a private network requires ma...
Glossary terms from week 2
Glossary terms from week 2 Terms and definitions from Course 3, Week 2 Address Resolution Protocol (ARP): A network protocol used to determine the MAC address of the next router or device on the path Cloud-based firewalls: Software firewalls that are hosted...
Course 3 resources and citations
Week 1: Network architecture Resources Helpful resources to get started Coursera Code of Conduct Coursera Honor Code Coursera: Edit my profile Coursera: Learner Help Center Coursera’s Global Online Co...
The case for securing networks
Let's start by answering the question, why do we need secure networks? As you've learned, networks are constantly at risk of attack from malicious hackers. Attackers can infiltrate networks via malware, spoofing, or packet sniffing. Network operati...
Matt: A professional on dealing with attacks
My name's Matt, I'm a chaos specialist at Google. They let us choose our own job titles to best describe what it is we do. I spend a lot of my time planning for how to take care of anything that might possibly be going wrong, and when it does happen,...
Denial of Service (DoS) attacks
Welcome back. In this video, we're going to discuss denial of service attacks. A denial of service attack is an attack that targets a network or server and floods it with network traffic. The objective of a denial of service attack, or a DoS ...
Read tcpdump logs
A network protocol analyzer, sometimes called a packet sniffer or a packet analyzer, is a tool designed to capture and analyze data traffic within a network. They are commonly used as investigative tools to monitor networks and identify suspicious activity. Th...
Real-life DDoS attack
Previously, you were introduced to Denial of Service (DoS) attacks. You also learned that volumetric distributed DoS (DDoS) attacks overwhelm a network by sending unwanted data packets in such large quantities that the servers become unable to service normal u...
Malicious packet sniffing
In this video, we'll discuss packet sniffing, with a focus on how threat actors may use this technique to gain unauthorized access to information. Previously, you learned about the information and data packets that travel across the network. ...
IP Spoofing
Next, let's learn about another kind of network attack called IP spoofing. IP spoofing is a network attack performed when an attacker changes the source IP of a data packet to impersonate an authorized system and gain access to a network. In ...
Overview of interception tactics
In the previous course items, you learned how packet sniffing and IP spoofing are used in network attacks. Because these attacks intercept data packets as they travel across the network, they are called interception attacks. This reading will introduce you to...
temp
things to review On-path attack Distributed denial of service attack (DDoS) Denial of service attack (DoS) SYN flood attack IP spoofing Packet sniffing
Glossary terms from week 3 & wrap-up
Nice job finishing this section! Let's review what you've learned so far. We discussed how to secure networks. We also learned about network intrusion tactics like malicious packet sniffing and IP spoofing. Finally, we discussed how a securit...
Introduction to security hardening
I want to take a moment to congratulate you on your progress so far. First, you learned about network operations. Then, you learned about the tools and protocols that help network systems function. Next, you learned how vulnerabilities in netwo...
OS hardening practices
Hi there. In this video, we'll discuss operating system, or OS, hardening and why it's essential to keep the entire network secure. The operating system is the interface between computer hardware and the user. The OS is the first program loaded w...
Brute force attacks and OS hardening
In this reading, you’ll learn about brute force attacks. You’ll consider how vulnerabilities can be assessed using virtual machines and sandboxes, and learn ways to prevent brute force attacks using a combination of authentication measures. Implementing variou...
how to read a tcpdump
idk if this is correct but from my research this is what I've figured out An example TCP dump looks like this: Timestamp source IP > destination IP.protocol : flags [TCP flags], seq sequence numbers, ack acknowledgement number, win window size, options [TCP...
Network hardening practices
Earlier, you learned that OS hardening focuses on device safety and uses patch updates, secure configuration, and account access policies. Now we'll focus on network hardening. Network hardening focuses on network-related security hardening, like por...