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CISSP > Telecommunications and Network Security > Flashcards

Telecommunications and Network Security Flashcards

1
Q

What is a LAN?

A

A local area network (LAN) is a data network that operates across a relatively
small geographic area. LAN connects
workstations, servers, printers, and other devices so that network resources, can be shared

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2
Q

What is a WAN?

A

A Wide Area Network connects multiple LANs and other WANs by using telecommunications devices and facilities.

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3
Q

Types of WANs (3)

A

Internet, Intranet and Extranet

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4
Q

OSI Reference Model (7 Layers)

A

(1) Physical, (2) Data Link, (3) Network, (4) Transport, (5) Session, (6) Presentation, (7) Application.

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5
Q

Please Do Not Tells Sales People Anything

A

OSI Model memory mnemonic

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6
Q

VLAN

A

Virtual LAN. Implemented on network switches as a way lf logically grouping users and resources together.

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7
Q

Star Topology

A

Layer 1. Each node is directly connected to a switch, hub or concentrator.

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8
Q

Mesh Topology

A

All systems are interconnected to provide multiple paths to all other resources.

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9
Q

Ring Topology

A

A closed loop that conects end devices in a continuous ring.

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10
Q

Bus Topology

A

Bus
In a bus (or linear bus) topology, all devices are connected to a single cable
(the backbone) that’s terminated on both ends.

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11
Q

What is a Repeater?

A

Layer 1 device. Amplifies a signal to compensate for attenuation

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12
Q

What is a Hub?

A

aka a “Concentrator”, is used to connect mulitple LAN devices together. Dumb device. Sends signals to ALL devices on network.

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13
Q

What is a switch?

A

Layer 1/2. Used to connect multiple LAN device. A smart device. Sends signals to destination address only. The smart part is layer 2. The physical device is layer 1.

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14
Q

Data Link Layer (Layer 2)

A

Ensures message are delivered to proper device. The Data Link Layer formats messages from layers above
into frames for transmission, handles point-to-point synchronization and error
control, and can perform link encryption

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15
Q

Data Link Layer - Sublayers

A

LLC & MAC.

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16
Q

Layer 2 Protocols and transmission methods?

A

ARCnet, Ethernet, Token-ring, FDDI, ARP, RARP

17
Q

FDDI

A

Fiber Distribution Data Interface: The FDDI protocol transports
data to the physical LAN medium by using the token-passing media access
method that we discuss in the preceding section. It’s implemented as a dual
counter-rotating ring over fiber-optic cabling

18
Q

ARP

A

Address Resolution Protocol: ARP maps Network Layer IP
addresses to MAC addresses. ARP discovers physical addresses of
attached devices by broadcasting ARP query messages on the network
segment. IP-address-to-MAC-address translations are then maintained in
a dynamic table that’s cached on the system. Layer 2 protocol

19
Q

RARP

A

Reverse ARP. RARP maps MAC

addresses to IP addresses. Layer 2 protocol

20
Q

Unicast

A

Packets sent from single destination to a single destination.

21
Q

Multicast

A

Packets are copied and sent from source to multiple destinations using special multicast IP address

22
Q

Broadcast

A

Packets are copied and sent from source to every device on destination network using broadcast IP address.

23
Q

IEEE 801.11a (WLAN)

A

54 Mbps - 5 GHz

24
Q

IEEE 801.11b (WLAN)

A

11 Mbps; 2.4 GHz

25
Q

IEEE 801.11g (WLAN)

A

54 Mbps, 2.4 GHz (compatible with 802.11b)

26
Q

IEEE 801.11n (WLAN)

A

5 GHz or 2.4 GHz

27
Q

L2F

A

WAN Layer 2 Forwarding Protocol. A tunneling (encapsulation) protocol by Cisco. Used to implement VPNs and specifically PPP. Does not encrypt

28
Q

L2TP

A

WAN Layer 2 Tunneling Protocol. Used for VPSs. Uses UDP port 1701 to create tunneling session. May be used w/encryption protocol (e.g. IPSec).

29
Q

PPP

A

Point-to-Point Protocol. Succeeded SLIP. Provided router-to-router and host to network connections.

30
Q

PPTP

A

Point-to-point Tunneling Protocol. A Microsoft tunneling protocol used for VPNs and specifically PPP. Does not provide encryption, relies on other protocols.

31
Q

SLIP

A

Serial Line IP.

CISSP (8 decks)

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