Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

CISSP - Udemy > Telecommunications and Network Security > Flashcards

Telecommunications and Network Security Flashcards

1
Q

OSI Model

A

breaks communication process into layers

provides common framework for hardware and software developers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Layer 7, Application Layer

A

receives raw data from application in use and provides services to it

HTTP
DNS Queries
FTP
SMTP

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Layer 6, Presentation Layer

A

manner in which data from application layer is presented to the destination application layer

MIME
XDR

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Layer 5, Session Layer

A

adds information to packet that makes communication session possible between service or application on the source device with the same on the destination device

application or service in use is communicated with a port number

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Layer 4, Transport

A

establishes session between 2 physical systems

either connection-oriented (TCP) or connectionless (UDP)
UDP header is much smaller, fewer features than TCP.

UDP is low overhead, TCP is high overhead

the PDU here is called a segment

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Layer 3, Network

A

information needed route the packet is added here as a source and destination logical address (IP address)

PDU here is called a packet

examp protocols
IP
ICMP
IGMP
ARP
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Layer 2, Data Link

A

determines physical address for destination

Media Access Control (MAC)

PDU here is called a frame

Adds a trailer at the end of the frame, containing data to verify none of the data inside has been altered en route

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Layer 1, Physical

A

turns information into bits and sends it on medium

radio waves
electrical signals
light patterns

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

IP4 vs IP6 headers

A

IP4 is smaller but more complicated

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

TCP/IP Model

A

Has 4 layers

Application (OSI layer 5-7)
Transport (OSI layer 4 - same)
Internet (OSI layer 3)
Link (OSI layer 1-2)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Protocols and Ports to know

telnet
SMTP
SNMP
FTP
POP3
DNS
DHCP
LDAP
A 
telnet, TCP, UDP 23
SMTP UDP, 25
SNMP, TCP, UDP 161, 162
FTP TCP, UDP, 20,21
POP3 TCP, UDP, 110
DNS, TCP, UDP 53
DHCP, UDP 67, 68
LDAP TCP, UDP 389
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Network Transmissions

Asynchronous
Synchronous

A

Asynchronous - sender and receiver stay in synch with each other by sender inserting stop and start bits around the data

Synchronous - clock is used to synchronize the sender and receiver

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Broadband
vs
Baseband

A

broadband - connection divided into frequencies. Each device or stream gets a different channel (frequency)

baseband - time slots assigned to devices or streams

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Cabling

Coaxial

A

center core (solid or braided)

insulator, metallic shield, plastic jacket

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Cabling

Twisted Pair

A

conductor, insulator, cable jacket

4 pairs of cable, each twisted around the other to prevent crosstalk

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Cabling

Fiber Optic

A

core, cladding, outside jacket

17
Q

Collision Domains

A

any part of network where devices’ packets can collide

a switch provides unique collision domains for each port
every device on a hub is in same collision domain

18
Q

Contention Methods

CSMA/CD
CSMA/CA
Token Passing
Polling

A

CSMA/CD (wired ethernet)
(carrier sense multiple access collision detection). if a collision, message has everyone stop sending, then restart

CSMA/CA (collision avoidance) for wireless
devices tell each other when they’re getting ready to send

Token Passing (token ring)
devices can't send until they receive an empty token

Polling

19
Q

Network Protocols and Services

ARP

A

translates MAC to IP address

  1. send ARP request
  2. receive ARP reply
  3. adds to ARP cache
20
Q

Network Protocols and Services

DHCP

A
  1. client sends DHCP Discover packet
  2. server sends DHCP Offer packet
  3. client sends DHCP Request
  4. server sends DHCP Pack
21
Q

Routing Protocols

A 
Standards
RIP
IS-IS
OSPF
BGP
VRRP

Proprietary (Cisco)
IGRP, EIGRP

22
Q

Network devices

Patch Panel
Multiplexer

A

Patch Panel - termination point for cables

Multiplexer - combines several input signals into one output signal

23
Q

Network Devices

Hub

A

operates at layer 1

no intelligence

24
Q

Network Devices

Hub

Switch

A

Hub
operates at layer 1
no intelligence

Switch
intelligence. Has MAC address table

25
Q

Network Devices

Router
Gateway

A

Router - layer 3, routing table directs traffic

Gateway - any devices that performs a translation or acts as a control point for entry/exit

26
Q

Firewalls

Packet filtering
Stateful
Circuit Level Proxy
Application Level Proxy 
Dynamic Packet Filtering
Kernel Proxy
A

Packet filtering
Stateful
Circuit Level Proxy - proxy server. rules controls traffic

Application Level Proxy - operates at higher level of OSI model than circuit proxy.

Dynamic Packet Filtering - ability to open certain ports dynamical based on the connection iniated from inside network

Kernel Proxy - firewall that operates at kernel level

27
Q

Firewall Architectures

Bastion Host
Dual Homed
Three Legged
Screened Subnet

A

Bastion Host - unprotected, has to be locked down

Dual Homed - 2 NICS, one on internet, one to LAN

Three Legged - 3 NICs, one on internet, one to DMZ, one to LAN

Screened Subnet - 2 firewalls, area between them is the screened subnet

28
Q

Cloud Computing

IAAS
PAAS
SAAS

A

IAAS - Infrastructure, vendor provides hardware

PAAS - vendor provides HW and SW

SAAS - vendor provides HW, SW, application

29
Q

Network Types

LAN
Intranet
Extranet
MAN
WAN
A

LAN
Intranet - network within the LAN to host website

Extranet - network with resources accessible from outside world (partners, vendors)

MAN - network around a city, could be wired, wireless

WAN - wide area network

30
Q

WAN Technologies

US
T Carriers. T1, T3

Europe
E Carriers. E1, E3

A

T1 - 24 channels, 1.544 Mbps
T3 - 672 channels, 44.736 Mbps (28 T1’s)

E1 - 2.048 Mbps
E3 - 8.

31
Q

WAN Technologies

US
T Carriers. T1, T3

Europe
E Carriers. E1, E3

A

T1 - 24 channels, 1.544 Mbps
T3 - 672 channels, 44.736 Mbps (28 T1’s)

E1 - 2.048 Mbps
E3 - 34 Mbps

32
Q

CSU / DSU

Channel Service Unit / Data Service Unit

Data Communications Equipment (DCE)

Data Terminal Equipment

A

CSU/DSU
Connects LAN to WAN. Translates information from LAN format to WAN compatible

DCE - provides interface to router

DTE - router

33
Q

Network Connections

VOIP

A

create separate VLAN for IP phones

deploy VOIP aware firewall at perimeter

secure network layer with IPSec

34
Q

Remote Access Technologies

Dialup
ISDN
Cable
DSL

A

ISDN - Basic Rate (BRI)
3 channels, total 144 Kbps
ISDN - Primary Rate (PRI)
23 channels for 1.544 Mbps

DSL
Symmetric DLS

35
Q

Wireless Technologies

Frequency Hopping Spread Spectrum
Direct Sequence Spread Spectrum
Orthogonal Frequency Division Multiplexing

A

FHSS - bluetooth
DSSS - 802.11
OFDM - 802.11

36
Q

ICMP Attacks

Ping of death
Smurf
Fraggle
ICMP redirect
Ping scanning
A

Ping of death - so many pings that target can’t do anything else

Smurf - amplified ping of death

Fraggle - like smurf but UDP

ICMP redirect - attacker changes route

Ping scanning - network scan

CISSP - Udemy (21 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions