CCNA Objective 1

Question 1

1.1 Explain the role and function of a router.

Answer 1

A router is a device that can get you out of your local area network. The gateway (to the internet). Layer 3 device.

Question 2

1.1 Explain the role and function of a layer 2 switch.

Answer 2

A layer 2 switch forwards MAC address information across a network. They can also provide PoE.

Question 3

1.1 Explain the role and function of a layer 3 switch.

Answer 3

A layer 3 switch is a switch a switch that can route and send VLANs. It also forwards MAC address information across a network. They, too, can provide PoE.

Question 4

1.1 Explain the role and function of next-generation Firewall.

Answer 4

A firewall is a type of security control that sits between a network and the internet, allowing or preventing certain traffic to traverse the network. Next Generation Firewalls are firewalls that inspect every bit that comes through the network and can allow or disallow different functions even at the application level.

Question 5

1.1 Explain the role and function of an IPS.

Answer 5

An IPS is an Intrusion Prevention System. It watches network traffic on your LAN, detects threats, and stops attacks.

Question 6

1.1 Explain the role and function of an access point.

Answer 6

An access point extends the wired network onto the wireless network. It’s a layer 2 device.

Question 7

1.1 Explain the role and function of a Cisco DNA Center Controller.

Answer 7

The Cisco DNA Center Controller serves as a single, centralized point of control for the entire network infrastructure. It allows network administrators to manage a wide range of devices, including switches, routers, wireless access points, and security appliances, from a single graphical interface.

Question 8

1.1 Explain the role and function of a WLC Controller.

Answer 8

A WLC controller is a network device that plays a crucial role in managing and controlling wireless access points (APs) in a wireless network. The WLC centralizes control and management of the APs, providing various functions and benefits. It provides security, performance optimization, centralized configuration and monitoring, and the ability to scale to meet the needs of various wireless network environments.

Question 9

1.1 Explain the role and function of endpoints.

Question 10

1.1 Explain the role and function of a server.

Question 11

1.1 Explain the role and function of PoE.

Answer 11

PoE is Power Over Ethernet. It powers devices via Ethernet cables. Endspan PoE is power that comes over an Ethernet cable directly from a switch. Midspan PoE is power that comes over an Ethernet cable from an injector. Mode A PoE power is sent over a gigabit Ethernet connection that comes over all of the pairs on the cable, while Mode B PoE power is sent over a 10 to 100 megabit Ethernet connection that only comes over the unused wires on the cable.

Question 12

1.2 Describe the characteristics of a two-tier network topology architecture.

Question 13

1.2 Describe the characteristics of a three-tier network topology architecture.

Question 14

1.2 Describe the characteristics of a spine-leaf network topology architecture.

Question 15

1.2 Describe the characteristics of a WAN network topology architecture.

Question 16

1.2 Describe the characteristics of a SOHO network topology architecture.

Question 17

1.2 Describe the characteristics of an on-premise network topology architecture.

Question 18

1.2 Describe the characteristics of a cloud network topology architecture.

Question 19

1.3 What is single-mode fiber?

Answer 19

Long range communication, up to 100km. Usually uses lasers as a light source (expensive).

Question 20

1.3 What is multimode fiber?

Answer 20

Short range communication, only up to 2km. Usually uses LEDs (cheap). it’s called multimode because it has a larger core than single mode, and sends multiple modes of light through it, which bounces around a lot until it gets to its destination.

Question 21

1.3 Briefly describe copper cabling.

Answer 21

Can be STP or Coax. Most common. Broadband. Transmission across multiple frequencies and uses different traffic types such as digital TV, voice, and internet.

Question 22

1.3 What is Twisted Pair?

Answer 22

Two wires with equal and opposite signals; Transmit+, Transmit- / Receive+, Receive-. Positive and negative are twisted around each other. This is done to avoid interference from any other cable. There’s different twist rates too.

Question 23

1.11 What are the best practices for antenna placement?

Answer 23

1) Limit your wireless coverage so that it covers the building, but does not extend outside of it, and 2) make sure frequencies (such as the channels on the 2.4MGHz frequency) aren’t overlapping inside the building.

Question 24

1.11 What are the groups of Wi-Fi frequencies between the 2.4 GHz and 5 GHz range called?

Answer 24

Channels

Question 25

1.11 Describe the 2.4 GHz frequency.

Answer 25

Has a better range than 5GHz because the frequency bounces off objects. Limited amount of frequencies available, and lots of devices trying to get onto those frequencies. Does not have many channels.

Question 26

1.11 Describe the 5 GHz frequency.

Answer 26

Not as good of range as 2.4GHz because the frequency is usually absorbed by objects. Has many channels.

Question 27

1.11 What is bandwidth?

Answer 27

The amount of frequency in use on a Wi-Fi channel. Divided into 20, 40, 80, and 160 MHz.

Question 28

1.11 What is Channel Bonding?

Answer 28

Taking two adjacent frequencies on a 5GHz and having them work together as a single frequency with more bandwidth.

Question 29

1.11 What is an SSID?

Answer 29

Service Set Identifier. The name of the Wi-Fi/wireless network name.

Question 30

1.11 What is a BSSID?

Answer 30

Basic Service Set Identifier. The MAC address of the AP.

Question 31

1.11 What is an ESSID?

Answer 31

Extended Service Set Identifier. The wireless network name shared across multiple APs.

Question 32

1.3 What is an ad hoc connection?

Answer 32

Connecting one device to one other device with nothing in between. It’s now known as IBSS (Independent Basic Service Set)Two devices communicate directly to each other using 802.11, no access point required. This used to be called ‘Ad hoc’.