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CCNP Switch > CCNP switch slides 17 > Flashcards

CCNP switch slides 17 Flashcards

1
Q

source

A

http://www.coursehero.com/flashcards/430780/CCNP-SWITCH-642-813-Voice-and-Video/

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2
Q

What command will automatically trust QoS information received on a trunk?

A

mls qos trust cos.

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3
Q

How many ports on a Cisco IP phone’s internal switch?

A

3! Upload, PC, and phone!

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4
Q

Layer 2 devices can only utilize what one of the three basic QoS methods?

A

Best Effort Delivery.

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5
Q

When using the command “show inline power” a class of ‘n/a’ means what?

A

That the switch is providing power with ILP, and NOT 802.3af.

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6
Q

What is Differentiated Services Delivery?

A

Applying QoS on a per-flow and per-hop basis for all packets.

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7
Q

How does Cisco ILP detect if a device needs power?

A

The switch sends a tone along the line, and since Cisco IP Phones auto-loopback their interfaces when powered off, the switch will ‘hear’ the tone when it is sent back.

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8
Q

How much DC power is applied when using PoE?

A

48V DC

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9
Q

What is Integrated Services Delivery?

A

Establishing a dedicated path through the network before any data is sent. Think of this as circuit switching over a packet switched network.

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10
Q

How many classes of power are there in 802.3af? What is the default?

A

5 classes (0-4), default is 0 (15.4W)

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11
Q

When using dot1p to trunk a Cisco IP Phone, what VLAN is voice data sent on?

A

VLAN 0

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12
Q

What are the tree types of Auto-QoS options for voice?

A

Cisco-phone, Cisco-softphone, and trust (used for trunks/uplinks!)

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13
Q

Using the ‘mls qos trust’ command what are the tree things that can be trusted? what is generally used on IP phones?

A

cos, ip-precedence, or DSCP. cos is used for IP Phones.

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14
Q

If a port is not trusted in QoS, what happens to the voice packet QoS when they hit the switch?

A

They are overwritten by the switch! (bad!)

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15
Q

How does the command ‘mls qos’ affect the way a switch trusts QoS markers?

A

Without it, the switch trusts everything. With it, the switch trusts NOTHING!

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16
Q

Typically, when should an organization trust QoS parameters, and when should it NOT?

A

Trust when it is generated within your own network, and do NOT trust at the boundary with any external organization.

17
Q

What is the best way that a switch can detect power requirements to a phone when running ILP?

A

By exchanging CDP information.

18
Q

At what layer should Auto-QoS be used?

A

the access layer, or wherever you have more QoS leveraging services (like IP phones!)

19
Q

What is a QoS trust boundary?

A

The perimeter formed by switches that do NOT trust incoming QoS.

20
Q

What does ‘power inline never’ do?

A

Disables PoE on that port.

21
Q

How many bits are used to classify layer 3 traffic when using ToS, and how many when using DSCP?

A

-ToS=3bits-DSCP=6bits

22
Q

What pins get the power in PoE?

A

Both methods send power over pairs 2 and 3 (pins 1,2 and 3,6) but 802.3af can also send on the other pairs (pins 4,5 and 7,8)

23
Q

What are the four trunking methods with a Cisco IP Phone?

A

VLAN-configured, dot1p, untagged, none.

24
Q

What are the three levels of Drop Precedence in DSCP? Which one gives better service?

A

Low, Medium, High. Lower is better.

25
Q

What are the two methods for providing PoE to connected devices?

A

Cisco Inline Power (ILP), and IEEE 802.3af

26
Q

What are the three basic types of QoS?

A

Best Effort, Integrated services, and Differentiated services.

27
Q

What is the only difference if trunking an IP phone with ‘untagged’ or ‘none’?

A

Untagged placed the voice/data information on the NATIVE VLAN. None placed the voice/data information on the Access VLAN.

28
Q

How does 802.3af detect if a device needs power?

A

It sends a small voltage over the line, and measures the resistance to see if the device is drawing power.

29
Q

QoS must be implemented where on the network to be totally effective?

A

on EVERY device that connects sender to receiver.

30
Q

Define Delay, latency, jitter, and loss.

A

-Delay is the time it takes a device to process data. -Latency is the total end-to-end delay time. -Jitter is the variance in end-to-end delay. -loss is the measure of packets that were not delivered to the destination.

31
Q

What is the range for IP precedence QoS values, what do they mean, and what is the default Class value?

A

0-7, default is 0 (best effort), 1-4 are Assured Forwarding (AF), 5 is Express Forwarding (EF), and 6-7 are for network information (routing protocols and STP).

32
Q

What is Best-Effort delivery?

A

First In First Out, packets are sent in the order that they are received.

CCNP Switch (16 decks)

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