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Flashcards in Ethernet Deck (30)
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1
Q

3 primary functions provided by layer 2 data encapsulation

A

Data link layer addressing.
Detection of errors through CRC calculations.
Delimiting groups of bits into frames.

2
Q

How dose QoS help support a network

A

Providing mechanisms to manage congested network traffic

3
Q

LLC

A

It places information in the frame allowing multiple layer3 protocols to use the same network interface and media.

4
Q

What are 2 services provided by the OSI network layer

A

Routing packets toward the destination.

Encapsulating PDUs from the transport layer.

5
Q

Why dose layer 3 perform anding on destination IP and subnet?

A

To ID net address

6
Q

3 characteristics of multicast address

A

A single packet can be sent to a group of hosts.

Multicast transmissions can be used by routers to exchange routing information.

Routers will not forward multicast addresses in the range of 224.0.0.0 to 244.0.0.255.

7
Q

Private IPs

A
  1. 0.0.0/8
  2. 16.0.0/12
  3. 168.0.0/16
8
Q

Public addresses

A
  1. 0
  2. 16-172.31
  3. 168
9
Q

TCP and UDP

A

Port numbering

Use of checksum

10
Q

Why are port numbers in TCP header of a segment

A

To enable a receiving host to forward the data to the appropriate application.

11
Q

What information is added to the TCP transport layer header to ensure communication and connectivity with a remote network device?

A

Destination and source port numbers

12
Q

What TCP mechanism used in congestion avoidance

A

Sliding window

13
Q

What are the two ways that TCP uses the sequence numbers in a segment

A

To identify missing segments at the destination.

To reassemble the segments at the remote location.

14
Q

Presentation layer

A

Compression

Encryption

15
Q

UDP

A

Provides basic connectionless transport layer functions.
UDP relies on application layer protocols for error detection.
UDP is a low overhead protocol that dose not provide sequencing or flow control.

16
Q

DHCP

A

Returned to pool when the lease expires

17
Q

Show interfaces

A

Layer1 and 2 details of switch port

18
Q

Where are Cisco debug output messages sent by default?

A

Console line

19
Q

User EXEC mode

A

>

20
Q

Priv EXEC

A

en

21
Q

Global config

A

Conf T

22
Q

Fast forward

A

Has the lowest latency

23
Q

What 2 functions are primary functions of a routers

A

Packet forwarding.

Path selection.

24
Q

SLAAC

A

Dynamic global IPv6 addressing to end devices without using a server that keeps a record of available IPv6 addresses.

25
Q

::1

A

Tests internal config of IPv6 host

26
Q

Segmentation

A

Process of dividing data stream into smaller pieces

27
Q

Highest level

A

DNS

POP

28
Q

Latency issue

A

In crease in host to host ping response times

29
Q

Fire wall

A

State full packet filtering

30
Q

Converged network

A

Reduce cost of deploying and maintaining the communication infrastructure