Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

CCNP Switch > CCNP switch slides 2 > Flashcards

CCNP switch slides 2 Flashcards

1
Q

Source

A

http://quizlet.com/3373135/ccnp-switch-deck-2-flash-cards/

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

How many links can be used in an EtherChannel?

A

2-8 FE, GE, or 10GE are bundled.

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

What types of link can an etherchannel be?

A

access or trunk

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

What are the restrictions for bundling into an Etherchannel?

A

must be same type, speed, VLAN(s), native vlan, pass the same set of vlans,duplex, and spanning tree settings

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

How are frames forwarded across a specific link?

A

hashing algorithm

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

What can the Etherchannel hash use?

A

source IP, dest IP, combination of source and dest IP, source and dest MAC, or TCP/UDP port numbers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What are the port channel load balancing methods?

A

src-ip, dst-ip, src-dst-ip, src-mac, dst-mac, src-dst-mac, src-port, dst-port, src-dst-port

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

What is the default mode of load balancing?

A

src-dst-ip

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

What are the two etherchannel negotiation protocols?

A

PAgP (Cisco proprietary) and LACP (standards-based)

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

What are the PAgP negotiation modes

A

on (all ports channel), auto (channels when asked), and desirable(actively asks to form a channel)

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

How does PAgP form etherchannels?

A

only on ports that have same static VLANs or trunking. It also modifies parameters of the channel if one of the ports is modified

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is a LACP priority?

A

the priority is a 2 byte value followed by the MAC that decides which ports are actively participating in Etherchannel (lower=higher priority)

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

How many potential links can LACP define?

A

16, of which up to 8 are active. The others are in standby

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

what is the range of PAgP channel group numbers?

A

1 to 64

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

By default, what submode does PAgP operate in with the desirable and auto modes?

A

silent

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

what should you do if you expect a PAgP capable switch at the other end vs. a server or host?

A

configure non-silent submode

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What are the steps to configure a PAgP port channel?

A

1-(opt) configure load balancing, 2-select the interface(s), 3-assign the protocol, 4-select the mode and submode

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What is the LACP priority range?

A

1-65535 (def 32768) lower priority, higher probability

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

How do you configure LACP standby links?

A

LACP port priority

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What are the steps to configure a LACP port channel?

A

1-(opt) set system priority, 2-select interface(s), 3-assign the protocol, 4-set the mode, 5-(opt) set the port priority

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

If one end of an Etherchannel (either type) is set to on and the channel doesn’t form, what should you check?

A

Both ends should be on because on modes doesn’t send PAgP or LACP packets

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

What must the other end be set to if PAgP desirable or LACP active mode is selected?

A

either desirable or auto mode

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Can two switches in the auto(PAgP) or passive (LACP) mode create a channel? Why?

A

no because they only participate if asked

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

What is the IEEE standard for STP?

A

802.1D

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
How are BPDUs spread?
multicast to 01-80-c2-00-00-00
26
What are the 2 types of BPDU?
configuration and TCN
27
How often are BPDUs sent?
2 seconds (def)
28
What is a bridge ID made up of?
bridge priority and MAC
29
What is the bridge priority range?
0-65535 (def 32768) lower=better
30
In a converged fabric, which switch(es) send config BPDUs?
root
31
How is root port decided upon?
lowest cumulative cost to root
32
What is the cost of a 10 Mbps link?
100
33
What is the cost of a 100Mbps link?
19
34
What is the cost of a 1Gbps link?
4
35
What is the cost of a 10Gbps link?
2
36
How many designated ports are there?
1 per segment
37
If there are 2 ports with same root cost, how is the tie broken for designated port?
1-lowest root bridge ID, 2-lowest root path cost, 3-lowest bridgeID, 4-lowest port ID
38
What are the 5 STP states?
disabled, blocking, listening, learning, forwarding
39
What is the STP disabled state?
admin down
40
What is the STP blocking state?
Can hear only BPDUs
41
what is the STP listening state?
can send and receive BPDUs
42
What is the STP learning state?
after forwarding delay, port can learn new MAC addresses
43
What is the STP forwarding state?
after another forwarding delay, the port can send and receive data frames, collect MAC addresses, and send and receove BPDUs
44
What are the 5 steps to manualy configure STP?
1-ID link path costs, 2-ID roodt bridge, 3-select root port (1/switch), 4-select designated port (1/segment), 5-ID blocking port
45
What is the STP hello timer?
Time between BPDUs sent by root bridge. Default of 2 seconds
46
What is the STP forward delay timer?
The time that a port spends in both listening and learning states . Default 15 seconds
47
What is the STP Max Age timer?
The time interval that a switch stores a BPDU before discarding it. Default 20 seconds
48
What is the default network diameter?
7 switches from root bridge
49
Where should you change the network diameter value?
Cisco recommends only on the root bridge
50
What is a topology change?
When a port moves into forwarding or from fowarding or learning to blocking.
51
What happens when the topology changes?
A TCN BPDU is sent out of the switch's root port. The switch will continue sending TCN's every hello interval until ack'd by upstream neighbor. The root bridge will send a Config BPDU to all switches
52
What happens when switches receive a configuration BPDU?
They shorten their bridge table aging times from default (300sec) to the fowarding delay (15 sec)
53
What is a direct topology change?
One that can be detected on a switch interface (ie. Up/down)
54
What is an indirect topology change?
The link status stays up, but something between them has failed or is filtering traffic
55
What is an insignificant topology change?
A host port goes up or down
56
What is common spanning tree (CST)?
Single instance of STP for all VLANs. BPDUs are sent over trunks using the native VLAN with untagged frames. Dot1q based
57
What is Per VLAN STP (PVST)?
Cisco proprietary. 1 instance of STP/VLAN. Requires ISL instead of dot1q
58
What is PVST plus (PVST+)?
allows devices to interoperate with PVST and CST. Can use both dot1q and ISL
59
What is the port ID?
16 bits (8b port priority, 8b port number)
60
what is the port number range?
0-255
61
what is the port priority range?
0-255 (lower is better)
62
Where should STP timers be configured and why?
on root, because the root bridge propagates timers with config BPDU
63
How do you automatically configure STP timers
use the spanning-tree root macro
64
What is portfast?
almost eliminates listening and learning states for single hosts on an access link
65
What does the switchport host macro do?
enables portfast, sets the port to access and disables PAgP
66
What does uplinkfast do?
enables switches at the end of the spanning tree branches to have a functioning root port while keeping 1 or more redundant potential ports in blocking mode. When the main fails, the other comes up.
67
What are the gotchas for uplinkfast?
should be used on access switches, can't be used on root, keeps enabled switch from becoming root by raising priority of switch and all ports, making them undesirable
68
How does uplinkfast handle changes in topology?
notifies upstream neighbors by sending multicasts on behalf of hosts at the interval of the max update rate parameter.
69
What is backbonefast?
causes switch to actively determine whether alternative paths exist to root bridge in case ther eis an indirect failure
70
How does backbonefast determine whether alternative paths exist?
1- inferior BPDU on blocked-considered alternative, 2-inferior on root-all blocked ports considered alternate, 3-if inferior arrives on root and no blocked ports, assumes loss of connectivity to root
71
What is a root link query (RLQ)?
backbonefast uses RLQ to determine if upstream switches have stable connections to root bridge
72
How does backbonefast work?
by short-circuiting the max age timer
73
How should backbonefast be configured?
on all switches in network to enable RLQ request and reply
74
When are new path costs from BPDUs computed on a switch?
when the BPDU comes IN the switch.
75
When is the UplinkFast command not allowed?
On the root bridge switch.
76
What are the 5 STP port states?
Disabled-Blocking-Listening-Learning-Forwarding
77
What is the STP Max Age timer?
The time that a switch stores a BPDU before discarding it. Default is 20 seconds. Range is 6-40
78
Define STP PVST.
Per-VLAN Spanning Tree. Cisco Proprietary, and operates a separate instance of STP on each VLAN. Requires ISL encapsulation between switches. PVST and CST cannot easily coexist.
79
How many root ports can a single switch have?
Only ONE, that always points towards the root bridge!
80
If a switch has BackboneFast and any blocked ports, what does it use to figure out alternate paths?
The Root Link Query (RLQ) protocol.
81
What is the STP path cost of 10G, 1G, 622M, 155M, 100M, and 10M?
2, 4, 6, 14, 19, and 100
82
What is the value range and default value of STP port priority?
0-255, and defaults to 128.
83
When should you use STP PortFast?
Only from access layer switches to workstations.

CCNP Switch (16 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions