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Network+ > Networking Devices 009 > Flashcards

Networking Devices 009 Flashcards

1
Q

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

A

Router

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2
Q

What OSI Layers are routers and switches on?

A

Switch is Layer 2, Router is Layer 3

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3
Q

What do routers do?

A

Route traffic between IP subnets

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4
Q

What device operates at the MAC address layer?

A

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

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5
Q

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

A

Switch

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6
Q

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

A

Multi layer switch

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7
Q

What does a firewall do?

A

Filter traffic by port number or application

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8
Q

How do traditional firewalls work?

A

They filter traffic by TCP/UDP port number

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9
Q

How to NGFWs work?

A

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

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10
Q

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

A

Firewalls

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11
Q

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

A

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

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12
Q

IDS/IPS may be integrated into what other system?

A

NGFW

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13
Q

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

A

Mostly buffer overflow or XSS

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14
Q

What does a load balancer do?

A

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

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15
Q

What are some specific functions of a load balancer?

A

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

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16
Q

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

A

Proxy Servers

17
Q

What is does NAS allow us to do?

A

Access a shared storage device across the network

18
Q

What level access does NAS support

A

File level access

19
Q

What is SAN

A

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

20
Q

What level access does SAN support

A

block level access

21
Q

what is a downside to SAN and NAS

A

uses high bandwidth, so high speed network tech is desirable

22
Q

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

A

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.

23
Q

What is an access point?

A

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

24
Q

What OSI layer is an access point?

A

Layer 2

25
Q

What type of network is 802.11?

A

wireless network

26
Q

what type of network is 802.3?

A

ethernet

27
Q

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

A

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

28
Q

What does a VPN do?

A

secure private data traversing a public network by encrypting it and obscuring your IP address.

VPNs can be integrated into a firewall

29
Q

What is a CDN and what does it do?

A

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

30
Q

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

A

Allows the operator to prioritize bandwidth usage.

31
Q

What is TTL?

A

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

32
Q

How can you fix a packet caught in a loop?

A

TTL

33
Q

What is a routing loop?

A

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.

34
Q

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

A

Mac/Linux 64 hops
Windows 128 hops

35
Q

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

A

Seconds.

Network+ (12 decks)

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