3 Flashcards
What are some ways to reduce the AP coverage area?
Reduce AP transmit power
Increase minimum mandatory data rate
Which antenna type should be used for a site-to-site wireless connection?
Yagi
What is calculated using the numerical values of the transmitter power level, cable loss, and antenna gain?
EIRP
What does the LAP send when multiple WLCs resolve the domain name during the CAPWAP discovery and join process,
Unicast discovery request to each WLC
What are the PAGP modes?
Desirable
Auto
On
Which DNS lookup does an AP perform when attempting CAPWAP discover?
CISCO-CAPWAP-CONTROLLER.local
What feature allows legacy clients in a WLAN to connect while still allowing other clients to use fast transition based on their OUIs?
Adaptive 802.11r
What are some common sources of interface for Wi-Fi networks?
Radar
Rogue AP
What two components are needed to compute SNR?
Noise floor
RSSI
What OSPF network types are compatible and allows communication through the two peering devices?
broadcast to non-broadcast
broadcast to broadcast
non-broadcast to non-broadcast
p2p to p2p
Which debugging statement allows you to see hello messages a router has sent/received on interface g1/0?
debug ip ospf hello
#debug condition int g1/0
When are multicast RPs needed?
To start new sessions with sources and receivers
What EtherChannel mode should be configured on a switch to allow the WLC to connect and increase total throughput and redundancy on the links?
On
What must match to establish OSPF neighborship?
Hello/dead times
Area ID
Auth type/data
Subnet
MTU size
Stub flag
What should you configure to elect a root port on an upstream switch?
Configure port priority
What should you configure to elect a root port on downstream switches?
Modify port cost
What is the default port priority?
128
What is the order of preference for selecting a path in BGP?
Weight
Local preference
AS path
Metric
What is the default local preference value in BGP?
100
What mechanisms can secure NTP?
Encrypted authentication mechanism
Access list-based restriction scheme
In OSPF, which LSA type points to the ASBR router?
Type 4
In OSPF, which LSA type points to the ABR router?
Type 3
Where should VTP pruning be enabled?
On VTP servers
What could cause an OSPF neighborship to be in the EXSTART/EXCHANGE state?
Mismatched MTU size
What should an engineer deploy if a customer has several small branches and wants to deploy a Wi-Fi solution with local management using CAPWAP?
Mobility Express
In what type of roaming is the anchoring feature use?
Layer 3
Does EIGRP or OSPF support unequal path load balancing?
EIGRP
What type of RP is OSPF?
Link state
What type of RP is EIGRP
Distance vector
What is the EIGRP metric based on?
Delay and bandwidth
What routing protocol makes it easy to segment the network logically?
OSPF
In EBGP, what does the Active state mean?
The local router is attempting to open a TCP session with the neighboring router
What is the default behavior of trunks?
To allow all VLANS
What is weight in BGP?
Value assigned to prefix
Higher weight is preference
Default = 0
Locally significant
What is local preference in BGP?
Used to choose outbound paths
Applies to whole AS group
Default = 100
Higher number is preference
What NTP stratum level describes NTP servers that are directly attached to an authoritative time source?
Stratum 1
How do you disable bpdu guard?
no spanning-tree bpduguard enable
#shut
#no shut
What happens if controllers in a mobility group are not using the same virtual interface?
Roaming appears to work but hand-off does not complete and client uses connectivity for a period of time
What is the role of the RP in PIM sparse mode?
The RP is the multicast router that is the root of the PIM-SM shared multicast distribution tree
What is the process of storing controller IP addresses on an AP for later deployment called?
Priming
Why would an AP join a different WLC from the one specified in option 43?
The AP has previously joined a controlled and has been primed with a primary, secondary, and tertiary controller
What kind of roaming occurs if APs are connected to different WLCs?
Inter-controller
What kind of roaming occurs if the APs are on the same WLC?
Intra-controller
What helps LAPs with CAPWAP discovery?
DHCP option 43
Configure ip-helper address
In what kind of connection in OSPF is there no DR and BDR?
Point-to-point
What is dynamic channel assignment?
Allows client to switch from one channel to another, causes a disruption
Default time = 10 minutes
What algorithm does EIGRP use?
DUAL algorithm
In what IGP can summaries be created anywhere in the IGP topology?
EIGRP
What does an RP do in PIM?
Send join messages toward a multicast source SPT
How does OSPF behave after a link failure?
Quickly computes new path
How does EIGRP behave after a link failure?
Maintains alternative loop-free backup path if available
What commands can be used to ensure a switch will become the root bridge?
spanning-tree 1 root primary
#spanning-tree 1 priority {increment of 4096} default is 32768
What does setting the DF bit do?
Decide if packets can be sent fragmented or not
What mechanism does PIM use to forward multicast traffic using a pull model?
PIM sparse mode
What mechanism does PIM use to forward multicast traffic using a push model?
PIM dense mode
What does OSPF use to calculate metric?
Bandwidth only
What is a possible cause of an EtherChannel misconfiguration that shoes no ports in the summary output?
Correct port members not defined
What encryption hashing algorithm does NTP use for authentication?
MD5
How is priority configured on STP?
In increments of 16
Default priority is 128
What L2 security policies should be used to leverage Wi-Fi 6 speeds on the WLAN?
802.1x
OPEN
What are ways an AP can discover a WLC?
DHCP option 43
Broadcasting on the local subnet
What is the responsibility of a secondary WLC?
Registers LAPs if the primary controller fails
What is FlexConnect?
A wireless solution for branch office and remote office deployments
Can tunnel traffic back to the controller when connected to the controller
How must spanning-tree be configured if you want multiple VLANs?
spanning-tree portfast trunk in interface config mode
What does BPDU filtering do?
Allows you to avoid transmitting BPDUs on PortFast-enabled ports that are connected to an end system
What antenna types are omnidirectional?
Ceiling mount
Dipole
What antenna types are directional?
Yagi
Patch directional
Parabolic dish
How would a LAP discover a WLC within a LAN?
DHCP option 43
How would a LAP discover a WLC outside of a LAN?
Use an IP helper address
#int vlan [int]
#ip helper-address [add]
What is the AP decision process priority?
- WLC it has joined before
- Primary controller
- WLC with lowest number of APs
