Network and Security - Foundations - C172 - Most Import Materials for Final Objective Assessment Test complete questions with expert solutions + rationales

802.11a/Wireless-A

wireless 5GHz - 54Mbps - 75ft

802.11b/Wireless-B

wireless 2.4GHz - 11Mbps - 100-150ft

802.11g/Wireless-G

2.4GHz - 54Mbps - 150ft

802.11ac/Wireless-AC

5GHz - 1.3Gbps

802.11n/Wireless-N

2.4GHz - 200+Mbps

2.4GHz

Frequency ranges of 802.11G/802.11B

5GHz

Frequency ranges of 802.11AC/802.11A

Application Layer

Layer 7 in the OSI model. Support for applications. Examples: HTTP, FTP, SMTP

Presentation Layer

Layer 6 in the OSI model. Protocol conversion, data translation. Examples: ASCII, JPEG

Session Layer

Layer 5 in the OSI model. Establishes, manages, and terminates sessions. Examples: NFS, SQL

Transport Layer

Layer 4 in the OSI model. Ensures error-free packets. Examples: TCP, UDP

Network Layer

Layer 3 in the OSI model. Provides routing decisions. Examples: IP, IPX

Data Link Layer

Layer 2 in the OSI model. Provides for the flow of data. Examples: MAC addresses.

Physical Layer

Layer 1 in the OSI model. Signals and media. Examples: NICs, twisted-pair cable, fiber.

OSI model

Application, Presentation, Session, Transport, Network, Data Link, Physical. (Please Do not Through Sasuage Pizza Away)

Application Layer (TCP/IP)

Defines the applications used to process requests and which ports and sockets are used

Transport Layer (TCP/IP)

Defines the type of connection established between hosts and how acknowledgements are sent

Internet Layer (TCP/IP)

Defines the protocols used for addressing and routing the data packets

Network interface Layer (TCP/IP)

Defines how the host connects to the network

The well-known ports

TCP/IP Ports 1-1023

Registered ports

TCP/IP Ports 1024-49,151

Private ports

TCP/IP Ports 49,152-65,535

Social Engineering

A process by which an intruder obtains enough information from people to gain access to the network

Password Cracking

An attack in which the attacker tries to guess the user's password

Dictionary Attack

An attack that uses known passwords and many variations (upper- and lowercase and combinations) to try to log in to an account

Brute-Force Attack

An attack in which the attacker uses every possible combination of characters to guess the password

Packet Sniffing

A technique in which the contents of data packets are watched

Man-in-the-Middle Attack/MITM

An attack in which an attacker can seamlessly place itself in the middle of a conversation between others in order to become the recipient of all information sent by victim computers

ARP Cache Poisoning

ARP Cache Poisoning Attack

An attack in which an attacker changes the MAC addresses of the ARP cache, or "poisons the ARP cache" of victims to the MAC address of the attacker so that conversations get redirected to the attacker

Evil Twin Attack

A situation in which a rogue wireless access point poses as a legitimate one by broadcasting a legitimate SSID and eavesdrops on the wireless network

Session Hijacking

Exploiting web session control by stealing a session cookie and using it to establish a session with a remote server that still thinks the session is valid

Buffer Overflow

A situation that occurs when a program tries to put more data into a buffer than it was configured to hold

Zero-Day Attack

An attack that exploits a software vulnerability that is unknown to the developer

Denial of Service Attack/DoS

An attack in which service is denied to a computer, network, or server

Permanent DOS Attack/PDoS

A malicious attack that aims to sabotage hardware and render it useless

14

Amount of channels implemented with 802.11 DSSS

3

Non overlapping 802.11 DSSS channels in america

10.X, 172.16.X-172.32.X, 192.168.X

Private Addresses Range

SAN

Block level storage

NAS

File level storage

HSM/Hardware Security Module

A hardware security module is a physical computing device that safeguards and manages digital keys for strong authentication and provides cryptoprocessing

Wiretapping

This exploit actually breaches the physical medium or uses devices to monitor signals from outside the physical medium itself.

CAT 5e

Supports 1000Mbps transmission speeds at 100-meter segments. Bandwidth: 100MHz

CAT 5

Supports 100Mbps transmission speeds at 100-meter segments. Bandwidth: 100MHz

CAT 6

Supports 1000Mbps transmission speeds at 100-meter segments. Bandwidth: 250+MHz

CAT 6a

Supports 10Gbps transmission speeds at 100-meter segments. Bandwidth: 500+MHz

Proxy Server

This firewall feature can be used to authenticate users on behalf of another secure system