25B Networking Essentials Exam with complete verified solutions already graded A+

What is NOT a physical layer problem?

Wireless

2 benefits of NAT?

Save public IPs

Extra layer of security

Reach limit for a twisted-pair cable?

100m

Data encoded using light?

Fiber optic

Throughput definition?

The measure of bits transferred over time

How many bits in a hextet?

16

What is Layer 3?

IP or Logical

What is Layer 2?

MAC or Physical

What allows Ipv6 and Ipv4 to be used simultaneously?

Dual stack

802.11 Standard

WIFI

802.15 Standard

Bluetooth

When configuring your secret password without line con 0, what configuration mode should it be in?

USER EXEC

What does the command #service password-encryption do?

Encrypts all plain text passwords

What are features of multicast?

Specific IP

Router

1 to Group of Hosts

What assists in collision prevention?

CSMA/CA

2 benefits of a Layered Network model?

Assists in protocol design

Prevents 1 layer from effecting other layers

When a PC works straight out of the box, what is enabled?

Static

DHCP

HTTP port number

443

What is Tunneling?

Encapsulation of IPV4 and IPV6

Purpose of SSH?

To secure access / Data

Process of condensing servers is called what?

Virtualization

3 commands used on console to lock in?

Line con 0

password cisco

login

When a DHCP discovers a message for MAC addresses on Layer 2, what letter is used?

F's

What type of attack is the ping of death?

Denial of Service - DOS

Purpose of a Subnet Mask?

Identifies the network of its connected host

What is the 1st thing a PC searches for when started up?

Flash memory

DORA is?

Discover

Offer

Request

Acknowledge

ARP

Address Resolution Protocol

Access Layer

Connects to hosts in a LAN

Distribution Layer

Interconnects the smaller local networks

Core Layer

Provides high speed backbone between layer devices

Encapsulation definition

Adding headers to a packet so it can be sent using another higher level protocol

- at source, moves down the stack, adds headers onto message

- at destination, moves up the stack, strips headers off original message

T568A

Cross over

2 like devices

T568B

Straight Through

2 unlike devices

Crosstalk

A type of interference caused by signals traveling on nearby wire pairs infringing on another pair's signal

Metal wires in cables use:

Electrical impulses

Fiber optic uses:

Light pulses

Wireless connection uses:

Electromagnetic waves

Not a criterion for choosing a network media?

TYPE of data than can be transmitted

What is the term for using tap to pay? Ex) Apple pay

NFC

3 areas of concern when setting up a Wireless Network?

Security

Coverage Area

Interference

PC to Switch connection requires what wiring?

Straight through

2 ports for configuration on a router?

Console

Auxiliary

Feature on a Wireless Router that prevents people from accessing it?

MAC Filtering

Connects Analog to Digital

VOIP

What prevents Trojan Horses?

Anti-virus Software

Interface Default SSI?

VLAN 1

2 files found in RAM?

Startup config

IOS image file

Which TCIP layer uses addressing?

Internet Layer

IPV6 Broadcast method?

Multicast

Anycast

Unicast

Which 2 things have to be configured to remote into a Switch?

Vlan 1

Default Gateway

Which method encapsulates IPv6 into IPv4

Tunneling

Term for a fraudulent email

Phishing

How many bits is in an IP address?

32 Bits

How many bits is in an IPv6 address?

128 Bits

What is a quicker way to find your useable IP?

256 minus 4th octet number

IEEE

Creator of wireless standards

Most frequently used ranges?

2.4 + 5 G/Hz

Tests wireless LAN devices from other manufacturers?

Wifi-Alliance

Purpose of NAT64

Converts IPv6 into IPv4

Type 1 Hypervisor

A 'bare metal' hypervisor in which you install directly on the server's hardware

Type 2 Hypervisor

'Hosted' virtualization environment. Host operating system (i.e. Windows/Linux) runs this hypervisor

Viruses do what to a PC?

Replicates by modifying itself

Cannot start by itself

Worms do what to a PC?

Uses network to spread

Spreads by itself

What is a Trojan Horse?

An attack tool that disguises itself as a pop up or an update

WEP is what?

Easy to crack

WPA2 is the preferred method

What server uses IMAP

Email

2 components on IPv4 addresses?

Host

Network

Command to find IOS Version + Software Used

show version (1st Line)

Command to find Register

show version (Last Line)

Command to find Flash Version

show flash (total)

Command to find Multicast Groups

show ipv6 int brief

Command to get MAC Address

ip config /all