Chapter 2 Flashcards by Nugget Box

What port replaces the root port when the root port fails?

Alternate port

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What state does PortFast place a port in when configured?

Forwarding

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What port states exist in STP but not RSTP?

Blocking and listening

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what port state exists in RSTP but not STP?

Discarding

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In Rapid PVST+, which port state can send and receive BPDUs but does not forward packets?

Learning

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What is the default VTP mode of a switch?

Server

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What kind of traffic is untagged between switches?

Traffic in native VLANs

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What is a minimum requirement with VTP configuration on switches?

Same VTP domain name, the server must have the highest revision number in the domain

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How will a switch configured with a vtp mode transparent interact with other switches in the same domain?

It will only forward the VTP advertisements that it receives on trunk ports

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What is the command to enable LLDP?

(config)# lldp run

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Which mode enables LACP only if a LACP device is detected?

Passive

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What modes actively negotiate EtherChannel?

Desirable and active

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Which EtherChannel mode must be configured when using LAG on a WLC?

Static, configured with the command “on”

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Which two STP states are bypasses on an interface running PortFast?

Listening and learning

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What is a benefit of using PortFast?

Faster convergence time and interfaces will not generate topology change notifications

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What command guarantees a switch will become the root bridge in VLAN 2?

spanning-tree vlan 2 priority 0

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What states does a switchport transition through while using RSTP?

Discarding, learning, and forwarding

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What are the default VLANs?

1, but also 1002-1005 for Token Ring and FDI

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What is the default VTP mode?

Server

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How does a switch configured as transparent behave?

They do not accept any VTP information from other switches You can still configure VLANs but you can’t push out the changes

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How does a switch configured as client behave?

They can store the same VTP information as switches in server mode but cannot modify any VTP information

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What is the configuration needed for configuring VLAN traffic that is untagged?

switchport trunk native vlan n

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How would you configure 802.1q encapsulation on VLAN 2?

encapsulation dot1q 2

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What interface subcommand statically configures the interface into VLAN 3?

switchport access vlan 3

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What does a trunk port do?

Connects network devices and supports the tagging of multiple VLANs

What do access ports do?

Provide a direct connection between a switch and an end device

Why would you use a LAG in a WLAN?

To aggregate multiple physical links to increase bandwidth and redundancy

Which protocol allows WLAN GUI access?

HTTPS

What are two required settings for configuring a new WLAN in the GUI?

Profile name, SSID

What are three required settings for configuring a new WLAN in the GUI that are configured with a default value that can be modified?

WLAN ID, admin state, radio policy

In a congested network, what could you enable to improve voice quality?

Band select

What would enabling static IP tunneling accomplish?

Allow clients to travel between different WLCs on the network and retain connectivity, even if the subnet changes

What 802.11 policy provides connectivity to only 2.4Ghz clients?

802.11b, 802.11g

What must you enable in the WLAN GUI to enable 802.11r(roaming)?

FT and PTK (Fast transition and Pairwise Transient Key)

What is required to enable 802.11w on a WLAN?

PMF (Protected Management Frames) PSK (Pre-shared Key) Specify Comeback timer and SA query timeout

What port does HTTP use?

TCP 80

What port does HTTPS use?

TCP 443

What is the extended VLAN range?

1006-4094

What is the configuration for creating VLAN 20 on a switch attached to an end device?

(config-if)#switchport mode access (config-if)#switchport access vlan 20

What command is used to disable the negotiation of VLAN trunking?

(config-if)#switchport nonegotiate

How do you configure a switch that communicates for multiple VLANs?

switchport mode trunk

What can we learn about a device through CDP?

Hostname IP and MAC address port capabilities platform/model

What command will show you whether or not CDP is running on an interface?

#show cdp interface

What is the default behavior of LLDP on a Cisco device?

Disabled by default on all interfaces, it must be manually enabled on any interface that requires it

What EtherChannel protocol is Cisco proprietary?

PAgP

What configurations on both sides must match for EtherChannel configuration?

Speed Duplex Switchport mode Native VLAN Allowed VLANs on trunks

What commands are needed to configure LACP?

#int range (config-if)# channel-group [#] mode active

How do you configure STP on a device?

#spanning-tree mode {pvst|rapid-pvst}

How do you configure Portfast on all access links?

#spanning-tree portfast default

What do you call a WAP that can function on its own?

Autonomous

What is Meraki?

The Cisco cloud, where WAP management is in the cloud rather than a physical controller

What kind of AP would you install if you want to centrally manage them?

Lightweight

How does a LAP communicate with the WLC?

CAPWAP

CAPWAP creates two tunnels, what are they for?

Data tunnel Management tunnel

What is Cisco Mobility Express?

Gives you the ability to install an AP that will also act as a WLC

How many LAPs and clients can a WLC support?

6,000 LAPs 64,000 clients

How many clients and LAPs can an AP with built-in WLC support?

100 LAPs 2000 clients

How many LAPs and clients can a VM-based WLC support?

3,000 LAPs 32,000 clients

What is the default mode of a LAP?

Local

What AP mode doesn't transmit any data but monitors the wireless environment for noise, interference, and rogue devices?

Monitor

What AP mode can act like a layer 3 switch and move traffic between an SSID and its respective VLAN without the WLC?

FlexConnect

What AP mode captures traffic that is sent from other devices?

Sniffer

What AP mode listens for traffic and collects the MAC addresses on the network that transmit data?

Rogue Detector

What AP mode connects two networks together?

Bridge

What AP mode collects wireless spectrum data to look for sources of interference?

SE-Connect (Spectrum Expert)

What port does Telnet use?

TCP 23

What is a console port?

Used for out-of-band management, system recovery, and initial boot functions

Which management access method is suitable for public networks?

SSH

How is HTTPS more secure than HTTP?

Encrypts data and uses SSL certificates

What port does RADIUS use?

UDP 1645/1646 or UDP 1812/1813

What port does TACACS+ use?

TCP 49

What is encrypted in RADIUS?

Only the password

What is encrypted in TACACS+?

Everything sent over the wire

Who typically uses RADIUS?

Users and clients for network access

Who typically uses TACACS+?

Administrators for device administration via Telnet, SSH, Console

What needs to be configured to allow different VLANs to communicate with each other in the same network?

Subinterfaces on a router that is connected to a switch

What command specifies the delay time for LLDP to initialize?

lldp reinit

What does BPDU Guard do?

Protects a port from receiving STP BPDUs, the port can still transmit STP BPDUs

What happens if a port configured with BPDU guard receives a BPDU?

The port is shutdown and put in an err-disabled state

What can you change to make a port the preferred forwarding interface?

The port priority

How does STP prevent loops?

Port blocking

How is the root bridge elected?

1. Lowest priority 2. Lowest MAC address

What could you configure in a WAN network for scalability and reliability?

Dual-homed branches Dynamic routing

What does the WLC perform in a lightweight AP network?

WLAN configuration and policy enforcement

How do you enable HTTP access to a WLC?

#config network webmode enable

How do you configure telnet and SSH support?

#Transport input telnet ssh

What protocol supports separate authorization and authentication methods for wireless networks?

TACACs+

Which mode creates two CAPWAP tunnels to the WLC?

Local mode

How often are CDP messages generated?

Every 60 seconds

What is the holdtime in CDP?

Default hold-down timer is 180 seconds The holdtime specifies the lifetime of an entry in the table - if no announcements are received from a device for a period in excess of the holdtime, the device information is discarded and wiped out

What can CDP do outside of device tracking?

CDP is used in output power negotiations for POE capable devices; like IP Phones, AccessPoints etc.

What does the hold time in LLDP do?

lldp holdtime specifies the number of seconds a receiving device should hold the information from your device before discarding it

What does reinit in LLDP do?

lldp reinit specify the delay time in seconds for LLDP to initialize on an interface

what does the timer in LLDP do?

lldp timer rate sets the sending frequency of LLDP updates in seconds

What configuration would make it so devices configured with LLDP do not send out their own system information?

no lldp tlv-select management-address

What timers can you modify in STP configuration, and what do they do?

Forward delay - Delay time for port state transition Hello time - Interval of sending configuration BPDUs to detect link failure Max age - Determines whether a configuration BPDU received by a port has expired

How do you change the forward delay timer in RSTP?

stp timer forward-delay time

In WLC configuration, what is the service port used for?

Out of Bound Management Must be configured in access mode (does not support 802.1q tagging)

What features do 802.11v use?

(Assisted roaming and power saving) Directed Multicast Service Base Station Subsystem (BSS) Max Idle Period

What is a benefit of using a cloud-based AP mode over autonomous?

Easier and less complex to maintain Automation

In SDN, what is used to interact with edge devices?

Southbound APIs

What is the underlay?

The underlying physical network of devices and connections which provide IP connectivity

What does switchport priority extend trust do?

Makes the switch tell a VOIP phone to trust the CoS priority of incoming data packets

In a split-MAC deployment, what device is responsible for prioritizing packets and responding to beacon/probe requests?

Lightweight APs

What does root guard do?

Assures that the interface where root guard is enabled is set as the designated port