Communications and Network Security/Network Models, Topologies and Protocols

Must post first. After reading this week's materials, please respond to one or more of the following questions.

1. Describe the differences between bus, ring, star and mesh topologies.
2. Explain the TCP/IP Model in terms of functions at each layer. How do the layers map to the OSI Model layers?
3. The Transport layer provides two service protocols: UDP and TCP. Explain the differences between the two protocols in terms of guaranteed vs. non-guaranteed service and connection-oriented versus connection-less communication.
4. Describe the different WLAN standards within the 802.11 family. What is a rogue access point?

Communications and Network Security/Network Devices, Attacks and Perimeter Security

Must post first.After reading this week's materials, please respond to one or more of the following questions.

1. Describe the functions of hubs/repeaters, bridges, switches, routers, and gateways. At what layers of the OSI model does each device operate?
2. Describe the following types of network attacks: denial of service (and DDoS), malformed packet attacks, flooding, sniffing, Ransomware, DNS hijacking, and drive-by download. Give an example of a DoS or DDoS attack and describe how it overwhelms a target system.
3. Depending on their needs and budget, companies can choose from a variety of perimeter security options. Discuss the differences between packet-filtering, stateful inspection, proxy, dynamic packet filtering, kernel proxy, and next generation firewalls and how they provide security filtering to protect the perimeter.