CompTIA Network Module 2 Lesson 4

Question 1

What is Open System Interconnection (OSI) model ?

Answer 1

• is a conceptual framework used to understand and standardize how data is transmitted over a network.

Physical (bits are transmitted over the wire)
Data Link (data is framed and error-checked)
Network (data is routed)
Transport (data is segmented and reassembled)
Session (connection is established)
Presentation (data is formatted)
Application (data is created)

Question 2

List the 7 OSI model.

Answer 2

Layer 1: Physical Layer
Protocols: RJ-45, Wi-Fi, fiber optics
Functions: Bit transmission, reception, signaling

Layer 2: Data Link Layer
Protocols: Ethernet, Wi-Fi, PPP
Functions: Framing, error detection, flow control

Layer 3: Network Layer
Protocols: IP, ICMP, IGMP
Functions: Routing, addressing, congestion control

Layer 4: Transport Layer
Protocols: TCP, UDP, SCTP
Functions: Segmentation, reassembly, error detection

Layer 5: Session Layer
Protocols: NetBIOS, SSH
Functions: Session establishment, maintenance, termination

Layer 6: Presentation Layer
Protocols: SSL, TLS, MIME
Functions: Data encryption, compression, formatting

Layer 7: Application Layer
Protocols: HTTP, FTP, SMTP, DNS
Functions: Data formatting, encryption, compression

Question 3

What is a multilayer switch ?

Answer 3

• MLS is a network switch that operates at multiple layers of the OSI model, specifically:
• Layer 2 (Data Link Layer): MLS switches at this layer, using MAC addresses to forward data packets.
• Layer 3 (Network Layer): MLS switches at this layer, using IP addresses to route data packets.
• Layer 4 (Transport Layer): Some MLS switches operate at this layer, using TCP/UDP ports to make forwarding decisions
• MS combine the functions of:
• Layer 2 switches: Forwarding data packets based on MAC addresses.
• Routers: Routing data packets based on IP addresses.

Question 4

What is a wireless controller ?

Answer 4

• WC is a network device that manages and controls wireless access points (APs) in a wireless local area network (WLAN). It’s also known as a wireless LAN controller or WLAN controller.

Question 5

What is roaming ?

Answer 5

• Roaming in networking refers to the ability of a wireless device to maintain its network connection while moving from one wireless access point (AP) to another.

Question 6

List 3 types of roaming .

Answer 6

• Intra-controller roaming: Roaming between APs managed by the same controller.
• Inter-controller roaming: Roaming between APs managed by different controllers.
• Inter-subnet roaming: Roaming between APs on different subnets.

Question 7

What is a Load Balancer in networking.

Answer 7

Question 8

What are IPS and IDS ?

Answer 8

Question 9

What is UTM appliance ?

Answer 9

Question 10

What is Next Gen Firewall (NGFW) ?

Answer 10