Networking Devices 009

Question 1

What device is commonly referred to as a Layer 3 Switch?

Answer 1

Router

Question 2

What OSI Layers are routers and switches on?

Answer 2

Switch is Layer 2, Router is Layer 3

Question 3

What do routers do?

Answer 3

Route traffic between IP subnets

Question 4

What device operates at the MAC address layer?

Answer 4

MAC address layer is the data link layer, which would be a switch.

Question 5

What OSI Layer 2 device forwards traffic based on data link address?

Answer 5

Switch

Question 6

What type of layer 2 device includes the layer 3 functionality of routing?

Answer 6

Multi layer switch

Question 7

What does a firewall do?

Answer 7

Filter traffic by port number or application

Question 8

How do traditional firewalls work?

Answer 8

They filter traffic by TCP/UDP port number

Question 9

How to NGFWs work?

Answer 9

By identifying applications on the network allowing you to manage whether they are allowed or denied.

Question 10

Some ___ also facilitate the encryption of traffic with VPNs between sites

Answer 10

Firewalls

Question 11

Aside from filtering, what are 2 other functions of firewalls?

Answer 11

encrypting traffic and acting as a router., including Network Address Translation.

Question 12

IDS/IPS may be integrated into what other system?

Answer 12

NGFW

Question 13

What types of attacks can IPS/IDS frequently detect/prevent?

Answer 13

Mostly buffer overflow or XSS

Question 14

What does a load balancer do?

Answer 14

distribute network traffic across multiple servers.
- Invisible to end user
-data farms, server farms
-great at fault tolerance, fast convergence

Question 15

What are some specific functions of a load balancer?

Answer 15

TCP offload, SSL offload, caching, prioritization, application centric balancing

Question 16

Many organizations don’t want end users to be able to directly connect to servers. what is the solution?

Answer 16

Proxy Servers

Question 17

What is does NAS allow us to do?

Answer 17

Access a shared storage device across the network

Question 18

What level access does NAS support

Answer 18

File level access

Question 19

What is SAN

Answer 19

storage area network, looks and feels like local storage
- efficient at reading and writing

Question 20

What level access does SAN support

Answer 20

block level access

Question 21

what is a downside to SAN and NAS

Answer 21

uses high bandwidth, so high speed network tech is desirable

Question 22

What is the difference between an access point and a home router?

Answer 22

a home router is a wireless access point and a switch in the same device. at the enterprise level, each device has a single function.

Question 23

What is an access point?

Answer 23

a bridge, extending a wired network to a wireless network.

Question 24

What OSI layer is an access point?

Answer 24

Layer 2

Question 25

What type of network is 802.11?

Answer 25

wireless network

Question 26

what type of network is 802.3?

Answer 26

ethernet

Question 27

what centralized management tool allows us to manage all access points from on place?

Answer 27

Wireless LAN Controller - deploy new APs - alerts - configure and deploy changes - usage reports

Question 28

What does a VPN do?

Answer 28

secure private data traversing a public network by encrypting it and obscuring your IP address. VPNs can be integrated into a firewall

Question 29

What is a CDN and what does it do?

Answer 29

Content Delivery Network, provides a way to get data from a central point to the end user. Geographically distributed caching servers.

Question 30

QoS Priority Rule List, also known as traffic shaping or packet shaping.

Answer 30

Allows the operator to prioritize bandwidth usage.

Question 31

What is TTL?

Answer 31

Time to Live, creates a timer that tells a system when to stop doing a task.

Question 32

How can you fix a packet caught in a loop?

Answer 32

TTL

Question 33

What is a routing loop?

Answer 33

Router A sends a packet to Router B, and back again. This occurs back and forth until it reaches a time to live. Easy to configure with static routing.

Question 34

IP contains a default TTL, what is the default TTL for Mac/Linux and Windows?

Answer 34

Mac/Linux 64 hops Windows 128 hops

Question 35

In routers, TTL is associated with hops. In DNS, what is TTL associated with?

Answer 35

Seconds.