WGU D315 Network and Security Foundation Exam Questions With All Correct Answers Verified Answers 2025 Marking Scheme New Update

WGU D315 Network and Security Foundation Exam Questions With All Correct Answers Verified Answers 2025 Marking Scheme New Update OSI layer 1 - Answer- Physical Layer (Cable, Hubs, Repeaters) OSI layer 2 - Answer- Data Link Layer (Frame, Switch, PPP, Ethernet) OSI layer 3 - Answer- Network Layer (Moves packets, IP) OSI layer 4 - Answer- Transport Layer (TCP, end to end connection) OSI Layer 5 - Answer- Session Layer (API, Sockets, Synch and send to port) OSI layer 6 - Answer- Presentation layer (Syntax and encryption layer, SSL, SSH, JPEG) OSI layer 7 - Answer- Application layer (end user layer, http, applications) Network Typology point to point - Answer- Two devices connect directly Network Typology bus - Answer- All devices connect to a central main line Network Typology Ring - Answer- All devices have two connections and form an endless ring Network Typology Star - Answer- All devices connect to a central point Network Typology Tree - Answer- Multiple devices connect together (on a switch) and then the switches are connected with each other Network Typology Mesh - Answer- All devices connect directly to each other Network Typology Hybrid - Answer- Multiple Network Typology within the network Which OSI layer is related to the IP protocol - Answer- Network 3 Which OSI layer is organizing the bits over the physical layer between devices in the same collision domain? - Answer- Data Link 2 - They are in the same Frame Which OSI layer is a Switch at? - Answer- Data Link 2 Which OSI layer is a WAP (Wireless Access Point) at? - Answer- Data Link 2 Which OSI layer is a router at - Answer- Network (3) TCP protocol is on what OSI layer - Answer- Transport (4) Cloud - where do I manage the OS Iaas or Paas? - Answer- Iaas What do I manage on Paas (2) - Answer- Application and Data Name the 3 CIA triades - Answer- Integrity, Availability and Confidentiality What is the CIA Triade Integrity? - Answer- Detects alteration in storage, transit and process What is the CIA Triade Availability? - Answer- Ensure Authorized Access, Performance and Backup Keeping unauthorized users out is not in this triade. What is the CIA Triade Confidentiality? - Answer- Protect from unauthorized access and use, protecting data access in storage, transit and process 100m long Cat 5 cable supports speeds up to - Answer- 100 Mb/s 100m long Cat 5e cable supports speeds up to - Answer- 1000 Mb/s or 1 Gb/s 100m long Cat 6 cable supports speeds up to - Answer- 10 Gb/s 100m long Cat 6a cable supports speeds up to - Answer- 10 Gb/s Does a firewall provide two way protection? - Answer- Yes, it protects ingress and egress data Firewall that only checks the address label - Answer- Packet Filter On what OSI level is a Packet Filter operating - Answer- Transport (checks TCP/UDP prot numbers) and Network (checks source and destination IP) What is a circuit level gateway - Answer- A firewall that conceals the true identity of the protected network (hides IP) on the transport (4) layer What does state in stateful mean? - Answer- It refers to the connection state between two computers Why do we need the 5th layer on a Stateful Inspection - Answer- In this connection, the firewall is creating temporary rules per session to permit communication (TCP) back to the sender. What is a stateful inspection - Answer- It reduces the amount of firewall rules. Firewall vendors implemented a feature that only needs one rule to allow the initial communication. How do we protect the application level with a firewall - Answer- With a proxy server, Middle man or Layer 7 firewall Can a packet filter firewall scan the packet content? - Answer- No, a layer 7 or proxy is needed What is a IDS - Answer- Intrusion Detection system. A system for detecting attempting intrusion. Related to intrusion prevention systems (IPS) that block suspected attacks What is IPS - Answer- Intrusion Prevention System that can block traffic if a malicious anomaly is detected Cyber Attack - Ransomware - Answer- Encrypts data. Attacker sells the key. Prevent with Virus scanner Cyber Attack - Man in the Middle - Answer- Eaves dropping. The data flows thru the middle man. The attacker can stop/change the data Cyber Attack - Zero Day exploit - Answer- New unheard vulnerability. Needs to be patched Cyber Attack - DNS tunneling - Answer- An attacker creates a bad server and connects it to the attacked domain name system. If now a request comes to the attacked server, the attacker can tunnel into the client and since dns connections are rarely monitored, the attacker stays hidden. Cyber Attack - XXS attack - Answer- Cross Site Scripting uses a web form to inject malicious code. Cyber Attack - Social engineering - Answer- Convince someone to give a you access to sensitive information Cyber Attack - DoS and DDos - Answer- Denial of Service attacks flood a server with too much traffic Cyber Attack - SQL Injection - Answer- A technique to add a string of sql code to a query to gain access to the targeted database