CCNP Switch Deck

Instructions:

• Answer 50 questions in 15 minutes.
• If you are not ready to take this test, you can study here.
• Match each statement with the correct term.
• Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. What is a drop adjacency?

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


2. How does dot1q do trunking?
To the virtual port-channel interface
Flash override (class 4)
5 classes with 3 drop precedences
Embeds the tag within the frame


3. If a wireless station needs to transmit and no other device is transmitting - what happens?
Trunk
The station can transmit immediately and wait for an ack
An instance of RSTP running for each VLAN on the switch. Changing from PVST to RPVST+ is disruptive
300 sec by default


4. How many MST instances can be in a region?
They must be carried over a voice VLAN (VVID) or over a regular data VLAN (ie. The native VLAN or the PVID)
Embeds the tag within the frame
By sending a gratuitous ARP
16 - IST gets MSTI 0 - 1-15 are available for use. MSTIs are locally significant to the MST region


5. What is the STP forward delay timer?
Yes
Auto mode
The time that a port spends in both listening and learning states . Default 15 seconds
Lowest cumulative cost to root


6. what do multilayer switches do?
Both layer 2 switching and IVR
1- root bridge is elected - 2-the state of eery switch port in the STP domain must be brought from blocking state to the appropriate state
RPR - RPR+ - and SSO
Configuration and TCN


7. What is RTP?
One that can be detected on a switch interface (ie. Up/down)
Cisco ILP and 802.3af
Real-time Transport Protocol
Each peer sends and receives hellos. Def hello is 3 sec - def hold is 10 sec


8. How does ILP do power discovery?
Distribution layer
Sends a test tone on the transmit pair. If a device is detected - CDP is used to narrow down the power class.
3 seconds. Holdtime =3 hellos + 1
An instance of RSTP running for each VLAN on the switch. Changing from PVST to RPVST+ is disruptive


9. How does adding option-82 to DHCP snooping affect things?

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


10. Define GLBP
Gateway load balancing protocol - cisco proprietary
TCAM
Per-port or globally for all fiber-optic ports. Can be enabled globally - but will only affect fiber ports
The number of STP instances needed ot support the desired topologies and whether to map a set of VLANs to each instance


11. How does L3 QOS classification happen?
A point to point port type
The switch adds its MAC to the option 82 field so that the DHCP reply echoes back the switch's own information
The TOS field in the header is used. 2 methods 3 bits or 6 bits
The master router can share the VIP


12. How does HSRP port tracking work?

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


13. What types of ports autonegotiate?
All nondesignated ports - but ok for all ports
FE and GE
The distribution layer should have only L3 links
An instance of RSTP running for each VLAN on the switch. Changing from PVST to RPVST+ is disruptive


14. Does VTP pass private VLAN configuration?
With the skinny protocol
The same as a standby group in HSRP
No
A host port goes up or down


15. What is a wireless mobility group?
Trunk
Tracks of BDPUs on nondesignated ports. When those BDPUs stop coming - the port is put into loop-inconsistent state and blocks
Per VLAN
A client can roam to any WLC as long as it stays in a mobility group


16. What is the access layer best practice?
When a specific interface is tracked - HSRP reduces it's priority after a specified interval.
All L2 connectivity should be contained within the access layer.
Etherchannel ports have inconsistent config
Distribution layer


17. What does the minimum keyword do in HSRP?
A point to point port type
Port with redundant - but less deisrable connection to a segment. Possibly root candidate
Within a single MST region - an IST instances runs to work out a loop free topology between links where CST meets the region boundary and all switches in the region. It runs at the boundary.
Forces the router to wait for a period of time before attempting overthrow


18. What is a BSS?
Only for trusted Cisco gear - especially phones
Using a single WAP to centralize access and control over a group of wireless devices.
Port with alternative path to root less desirable than root
19


19. static vlans offer ____ based membership
The switch checks the MAC and IP reported in the reply against trusted values. If they don't match - it is dropped and logged
Each physical interface has a different IP address. All physical interfaces point to a virtual interface called the standby address or VIP
Real-time Transport Protocol
Port


20. What is a punt adjacency?
Routers at the distribution layer become the bottlenecks or broadcast or multicast traffic slows the switches in the switch block
Packets must be sent to the L3 engine for further processing
Completed dhcp bindings - mac addresses - IP addresses - etc.
After forwarding delay - port can learn new MAC addresses


21. How is the HSRP MAC address configured?
Manages addition - deletion and renaming VLANs across the network
Roughly 2000
0000.0c07.acxx where xx is the group number as a 2-digit hex value
Multicasts to 224.0.0.18 (VRRP)


22. How does every GLBP command begin
Switch(config-if)# glbp xx where xx = group number
LACP port priority
Isolated and community
The L3 forwarding engine can't forward the packet in hardware because there is no L2 next-hop address - so the packet is sent to the L3 engine to generate the ARP response


23. How does an L2 switch do QOS?
An L2 switch can only forward frames best effort unless going across a trunk
An AP's coverage area
All user ports that have portfast enabled
All ARP packets that arrive on untrusted ports are inspected.


24. How are errdisable triggers tuned?
Completed dhcp bindings - mac addresses - IP addresses - etc.
Globally
1-client sends DHCP discover as broadcast - 2-DHCP server sends DHCP offer - client sends DHCP Request - DHCP server sends DHCP ack
Only for the offending VLAN on the port


25. How many potential links can LACP define?
Distribution
16 - of which up to 8 are active. The others are in standby
Differentiated services code point
Checks the source MAC in the header against the sender MAC in the ARP reply


26. How many users should be within a switch block?
When the AP uplinks to an Ethernet network.
The frame tag includes a 3 bit COS value from 0 (low) to 7 (high). Native vlans are untagged so no COS
Port that connects to another switch and becomes a designated port
Roughly 2000


27. What is PVST plus (PVST+)?
The port asks the other end to trunk
Switchpotrt nonegotiate
Allows devices to interoperate with PVST and CST. Can use both dot1q and ISL
900 MHz - 2.4Ghz - and 5-6GHz


28. How does RSTP converge?
1 IP subnet
Stateful switchover - redundant sup is fully booted and init'd. Both start and run config are synched as is L2 information - and switchinterfaces.
If a proposal is received - the recipient isolates - all nonedge ports blocked until proposal sent causing neighbors to synch - which propagates out in waves
With the skinny protocol


29. What is a proxy arp?

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


30. What is an end to end vlan?
A VLAN that spans the entire fabric
Turn on port security
Globally or per-port
Variation in delay


31. What is the default 10mbps Enet duplex?
Route processor redundancy - redundant sup is partially booted and initialized and must reload module in the switch and init all sup functions
Data goes over native vlan - voice goes over VLAN0 - voice QOS is 802.1p
Half-duplex
Port with best root path cost on segment


32. What is DSCP codepoint AF31(26)?
1-LAP gets a DHCP address - 2-LAP learns IP of available WLC - 3-LAP sends a join request to WLC and receives join reply - 4-WLC sends code image - if necessary - 5-Tunnels are created
Port stays up - packets from violating MACs dropped - no logging
1- inferior BDPU 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
Flash (class 3)


33. How long are TCAM masks?
134 bits
Needs hardware upgrade over WEP - uses AES encryption
1 second. Backup routers can learn the interval from the master
A host port goes up or down


34. What is a VRRP group?
No shut
Dynamic WEP keys that change periodically
Turn on port security
The same as a standby group in HSRP


35. What are the 4 steps to extend QoS trust?
Differentiated services code point
A client can roam to any WLC as long as it stays in a mobility group
1- enable qos - 2-define qos parameters to be trusted - 3-make trust conditional - 4-instruct IP phone how to extnd boundary
The number of times the entry has been updated since the table was generated


36. What is accelerated CEF (aCEF)?
Prevents the dhcp binding DB from being checked.
Based on priority (0-255). Default is 100. Highest IP is tie breaker
CEF is distributed across multiple L3 forwarding engines - typically on Catalyst 6500 line cards each having only a subset
2-8 FE - GE - or 10GE are bundled.


37. What is DCF?
Distributed coordinion function - the use of timers to prevent wireless collisions
Can hear only BDPUs
1/2 and 3/6
Reboots and searches for a new WLC


38. What are the gotchas for uplinkfast?

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


39. What is the STP disabled state?
Access or trunk
Bridge priority and MAC
Admin down
On (all ports channel) - auto (channels when asked) - and desirable(actively asks to form a channel)


40. What data does DHCP snooping track?
224.0.0.2 (all routers)
Usually QoS from VOIP but not PC dataa
Completed dhcp bindings - mac addresses - IP addresses - etc.
The station can transmit immediately and wait for an ack


41. What types of link can an etherchannel be?
Access
Both layer 2 switching and IVR
The number of times the entry has been updated since the table was generated
Access or trunk


42. What does Root Guard do?
802.1w
The DCF interframe space- the random backoff time before a wireless set can transmit
Controls where candidate root bridges can be connected and found on a network
CEF is distributed across multiple L3 forwarding engines - typically on Catalyst 6500 line cards each having only a subset


43. When looking at the sh spanning tree output - What does P2P peer(STP) denote?
Incoming frames are dropped (combination of disabled - blocking - and listening)
All ports where root isn't expected
Within a single MST region - an IST instances runs to work out a loop free topology between links where CST meets the region boundary and all switches in the region. It runs at the boundary.
A point to point port type but the neighboring device runs traditional 802.1D STP


44. If a port is configured for errdisable auto recovery - how long does it stay down?
300 sec by default
Yes
Sends special layer 2 UDLD frames and expects an echo. Both ends must be configured for UDLD
Use sh interface on the interface and look for error counts > 10


45. How does DAI work?
Embeds the tag within the frame
All ARP packets that arrive on untrusted ports are inspected.
Variation in delay
0000.0c07.acxx where xx is the group number as a 2-digit hex value


46. At what layer does EAPOL run?
L2
Half-duplex
Group (0-255) - priority (1-254 254 is highest - 100 default)
It updates the L2 headers with the proper src and dst MAC - L3 TTL - L3 checksum - and L2 checksum information


47. What is DSCP?
Bridge priority and MAC
The master router can share the VIP
Edge - root - and point to point
Differentiated services code point


48. What are 2 ways to configure VLAN and VTP information?
Nonstop forwarding is an interactive method focusing on rebuilding the RIB after SUP switchover
Src-ip - dst-ip - src-dst-ip - src-mac - dst-mac - src-dst-mac - src-port - dst-port - src-dst-port
The number of STP instances needed ot support the desired topologies and whether to map a set of VLANs to each instance
Global config (vlan - vtp mode - and vtp domain) and VLAN DB mode commands. Global config is preferred because VLAN DB mode commands are legacy


49. What is a service set?
To a VLAN and not to a VLAN interface (SVI)
A group of wireless devices that share a common SSID
Flash (class 3)
A client can roam to any WLC as long as it stays in a mobility group


50. Can ARP replies be checked
If a proposal is received - the recipient isolates - all nonedge ports blocked until proposal sent causing neighbors to synch - which propagates out in waves
Two distribution switches that aggregate one or more access switches
Yes
With the skinny protocol