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Networks > Test2 Review (part 2) > Flashcards

Test2 Review (part 2) Flashcards

1
Q

What is DHCP?

A

Dynamic Host Configuration Protocol. Automatically assigns IP address, subnet mask, default gateway, and DNS server.

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2
Q

4 steps to obtain an IP address from DHCP server.

A
  1. Discover (client broadcasts a request for a DHCP server). 2. Offer (server replies with a suggested IP address). 3. Request (client accepts the offer & requests the IP). 4. Acknowledge (server acknowledges the request).
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3
Q

How does a proxy server operate?

A

Makes a request on behalf of a client. Clients are configured to forward their packets to a proxy server, which evaluates the request. If it has a copy of the info the client wants, it replies with the cached copy, otherwise the server forwards the request to the internet.

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4
Q

HUB vs switch

A

HUB: layer 1, each port on single collision domain, no switching table, collision occurs, data not secure, less expensive.
Switch: layer 2, each port on separate collision domain, switching table, no collision, data secure, more features, more expensive.

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5
Q

VLAN advantages.

A

Allows admins to group hosts into LANs to enforce access rights, etc. Cost & time reduction in migration of host from one group to another. Security - users in other groups will not receive messages that weren’t meant for them. Allows creating new virtual workgroups.

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6
Q

Power over ethernet (POE)

A

Supplies electrical power over ethernet connections. IEEE 802.3af. Requires cat 5 or better.

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7
Q

What is a broadcast storm?

A

A broadcast storm is an abnormally high number of broadcast packets within a short period of time.

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8
Q

Communication principles.

A

An antenna attached to electrical circuit allows electromagnetic waves to be broadcast & received by a receiver some distance away.

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9
Q

Speed of electromagnetic waves in a vacuum.

A

180000 miles/sec (300000 km/sec)

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10
Q

Speed of electromagnetic waves in a copper wire.

A

2/3 of speed in a vacuum.

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11
Q

Long wave communication distance & kHz.

A

<30 kHz used to communicate across the globe. Can also penetrate saltwater to depths of 100’s of feet.

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12
Q

Short wave communication distance & MHz.

A

Generally 3-30 MHz (10-100 meters).

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13
Q

Cat 3 maximum distance & data rate

A

Distance = 100 meters, data rate = 10 Mbps

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14
Q

Cat 5 maximum distance & data rate

A

Distance = 100 meters, data rate = 100 Mbps

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15
Q

Cat 5e maximum distance & data rate

A

Distance = 100 meters, data rate = 1 Gbps

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16
Q

Cat 6 maximum distance & data rate

A

Distance = 100 meters, data rate = 1 Gbps

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17
Q

Cat 6a maximum distance & data rate

A

Distance = 100 meters, data rate = 10 Gbps

18
Q

Cat 7 maximum distance & data rate

A

Distance = 100 meters, data rate = 10 Gbps

19
Q

Ethernet frame minimum size. Also, what else is needed in the frame to transmit data.

A

Min size = 64 bytes. Source and destination addresses (MAC or physical) needed

20
Q

Ethernet bandwidth capacity

A

10 Mbps

21
Q

Fast ethernet bandwidth capacity

A

100 Mbps

22
Q

Gigabit ethernet bandwidth capacity

A

1 Gbps

23
Q

10-gigabit ethernet bandwidth capacity

A

10 Gbps

24
Q

100-gigabit ethernet bandwidth capacity

A

100 Gbps

25
Q

VPN concentrator

A

a type of networking device that provides secure creation of VPN connections and delivery of messages between VPN nodes. It is a type of router device, built specifically for creating and managing VPN communication infrastructures.

26
Q

What is VOIP?

A

Voice over IP - digitizes voice traffic so it can be treated like other data on a network.

27
Q

What is a call agent (VOIP component)?

A

Maintains a network’s dial plan (routes)

28
Q

What is PSTN (VOIP component)?

A

Public switched telephone network

29
Q

What is RTP (VOIP component)?

A

Real-time transport protocol that can carry voice & data in real-time

30
Q

What is SIP (VOIP component)?

A

Session Initiation Protocol - establishes a VOIP phone call.

31
Q

What is PBX (VOIP component)?

A

Private Branch Exchange

32
Q

Well-known port numbers

A

0-1023

33
Q

Registered ports

A

1024-49151

34
Q

Ephemeral (short-lived) ports

A

49152-65535

35
Q

ICMP definition & layer

A

Internet control message protocol. Used for managing & testing layer 3 functionality. Layer 3

36
Q

ARP definition & layer

A

Address resolution protocol. Allows determining MAC address from IP address. Layer 3

37
Q

DHCP definition & layer

A

Dynamic host configuration protocol. Configures hosts automatically with IP address & other info. Layer 2

38
Q

IETF definition

A

Internet engineering task force. Identifies operational problems & proposes solutions.

39
Q

IAB definition

A

Internet architecture board

40
Q

IRTF definition

A

Internet research task force. Focuses on long-term research on protocols, apps, architecture, & technology

41
Q

ICANN definition

A

Internet corporation for assigned names & numbers.

Networks (14 decks)

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