Network Plus Lecture Notes

Introduction

• Dean welcomes viewers back to his channel and introduces a video covering 50 Network Plus questions.
• Link to a Udemy course for more complex questions is provided in the description.

Key Questions and Answers

Question 1: Fault Tolerance in Network Topologies

• Question: Which network topology offers the greatest fault tolerance?
• Options: Mesh, Star, Hub and Spoke, Bus, Ring
• Answer: Mesh network provides the highest fault tolerance due to point-to-point connections, creating redundancy.

Question 2: OSI Model Layers

• Question: Which layer contains the MAC and LLC sub-layers?
• Options: Data Link Layer, Physical Layer, Network Layer, Transport Layer
• Answer: Data Link Layer

Question 3: Bandwidth Usage Approaches

• Question: Which approach consumes all available frequencies on a medium?
• Options: Time Division Multiplexing, Simplex, Broadband, Baseband
• Answer: Baseband technology uses the entire medium for transmission.

Question 4: Frame Encapsulation

• Question: What is encapsulated directly inside of a frame?
• Options: IP Packet, TCP Segment, UDP Datagram, ICMP Packet
• Answer: IP Packet

Question 5: DNS Root Name Servers

• Question: How do DNS root name servers respond to queries?
• Options: Give actual answers, Give referrals, Check authentication, Query another server
• Answer: Give referrals to appropriate DNS servers.

Question 6: Star Topology

• Question: What happens when a workstation loses its connection in a physical star topology?
• Answer: Only that workstation loses its ability to communicate.

Question 7: Three-Tier Architecture

• Question: What is at the top of the three-tier architecture?
• Options: H Control Layer, Distribution Layer, Aggregation Layer, Core
• Answer: Core layer ties together all switches and connects to external systems.

Question 8: Disaster Recovery Policies

• Question: What describes a setup with two data centers for minimal downtime?
• Options: Load balancing, Data mirroring, Hot site, Warm site, Multi-pathing
• Answer: Hot site provides full operational capability and quick recovery.

Question 9: IP Addresses and OSI Layers

• Question: IP addresses reside in which OSI layer?
• Options: Session Layer, Network Layer, Data Link Layer, Transport Layer
• Answer: Network Layer

Question 10: DHCP Scope Exhaustion

• Question: What should an administrator do when DHCP scope is exhausted?
• Options: Reduce lease time, Install more switches, Install load balancers, Decrease VLANs
• Answer: Reduce lease time to free up unused leases.

Question 11: MAC Spoofing Detection

• Question: Best option to detect a MAC spoofing attack?
• Options: ICMP, DHCP, IMAP, RARP
• Answer: RARP can help verify MAC and IP address accuracy.

Question 12: Connectionless Transport Protocol

• Question: Which is a connectionless transport layer protocol?
• Options: UDP, IP, TCP, SIP
• Answer: UDP does not establish a formal connection before sending data.

Question 13: Packet Size Control

• Question: What controls packet size in modern networks?
• Options: MTU, SSH, TTL, CSMA
• Answer: MTU (Maximum Transmission Unit) controls packet size.

Question 14: Peer-to-Peer vs Client-Server Networks

• Question: True statements about peer-to-peer vs client-server networks?
• Answer: In peer-to-peer, every workstation can authenticate users, while in client-server, it is centralized.

Question 15: Network Switch Configuration

• Question: What should be configured on a switch in a public location?
• Answer: Port Security

Question 16: UTP Cabling for Gigabit Ethernet

• Question: Which UTP cabling categories are used for 1000Base-T?
• Options: Cat5e, Cat5, Cat6, Cat6a
• Answer: Cat5e and Cat6

Question 17: Delivery of Information

• Question: At which OSI layer does a protocol that provides guaranteed delivery operate?
• Answer: Transport Layer

Question 18: Assignable IP Addresses

• Question: Assignable IP addresses in 172.16.1.10/27?
• Answer: 30 assignable IP addresses.

Question 19: Cloud Computing Characteristics

• Question: Which characteristic allows dynamic scaling of resources?
• Options: Scalability, Elasticity, Centralized, On-demand
• Answer: Elasticity

Question 20: Traffic Pattern Description

• Question: What traffic pattern refers to data traveling outside the data center?
• Answer: North-South

Conclusion

• Dean encourages viewers to subscribe, like, and comment to support his channel and course offerings.
• The video will continue with additional questions in future sessions.