CCIE Theory questions to know for test
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| BPDU protocol version for 802.1W | 2
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| Which three ports are used by 802.1W | 1 learning
2 forwarding
3 Discarding
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| What is the STP root Guard feature designed to prevent? | Port being assigned as a root port
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| Which are three combinations that are valid PAgP configurations that will setup a channel? | 1 ON-ON
2 Desirable-Auto
3 Desirable-Desirable
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| What is the most likely reason an OSPF point-to-point link is not forming adjacency? | Each interface has a different size MTU.
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| Three options used in the Spanning-tree decision process? | 1 Lowest root bridge ID
2 Lowest path cost to root bridge
3 Lowest sender bridge ID
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| Which three options are valid ways to filter routes from a BGP peer? | 1 Filter-list
2 Route-map
3 Prefix-list
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| Feature prevents guest from unplugging IP phone and connecting a laptop | Port Security with statically configured MAC addresses
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| Problem:Election of a new root bridge with unknown MAC address. | Enable bpduguard globally
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| What are the "bound IP addresses" used for in LDP? | These addresses are used to find the label binding in put in the LFIB by looking up these IP addresses in the routing table.
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| When troubleshooting duplex mismatches, which two are errors that are seen on the half duplex end? | 1 excessive
2 late collisions
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| Which two statements are true about traffic shaping? | 1 Out-of-profile packets are queued
2 Marking/remarking is not supported
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| In an 802.1s BPDU, what is the size of the configuration revision number? | 16 bits
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| What standard supports multiple instances of spanning tree? | 802.1s
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| Which three combinations are valid PAgP or static configurations the will set up a channel? | 1 On-On
2 Desirable-Auto
3 Desirable-desorable
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| What are two ways to force the selection of a root bridge in a network the is running the 802.1D protocol? | 1 Spanning-tree vlan vlan-id root
2 Spanning-tree vlan vlan-id priority 0
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| What are the port roles described by 802.1W | root port,designated port, alternate port, backup port, and disabled
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| spanning tree protocol calculates path cost on? | interface bandwidth
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| How many bytes make up the spanning-tree bridge ID? | 8
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| When troubleshooting duplex mismatches, which two are errors that are seen on the half duplex end? | 1 excessive collisions
2 late collisions
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| Which two statements describe spanning-tree BPDU processing for a blocking port? | 1 BPDUs that enter a blocking port are processed
2 Loopguard puts an interface in a loop-inconsistent state when BPDU's stop being received on a blocking port.
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| Where should Frame-relay traffic shaping be applied? | on the physical interface
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| Three that are true about cisco Spanning-tree features. | 1 STP bpdu's are relayed by all non-root bridges an RSTP bpdu's are generated by each bridge.
2 RSTP can only achieve rapid transition to forwarding on edge ports and on point-to-point links.
3 RPVST+ and RSTP based upon 802.1w specification .
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| In Frame relay, FECN messages indicationg congestion are sent or received by which of the following? | Received by the destination.
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| Three ports used by RSTP 802.1W? | 1 learning
2 Forwarding
3 Discarding
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| In which two ways does loop guard differ from UDLD in loop detraction and prevention? | 1 UDLD protects against STP failures caused by cabling problems that create one-way links.
2 Loop guard protects against STP failures caused by problems that result in the loss of BPDU's from a designed switch port.
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| Under which two circumstances would an RSTP bridge flush its CAM table? | 1 Upon receiving a topology change notification
2 When transitioning from discarding to forwarding
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| What two statements are true about LACP? | 1 LACP packets are sent with multicast group MAC address 01-80-c2-00-00-02
2 During detection LACP packets are transmitted every second
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| What statement is true about TCN propagation in RSTP (802.1W)? | The originator of the TCN immediately floods this information through the network.
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| If a port with STP loop guard stops receiving BPDUs, the port will be put into which state? | Loop-inconsistent state
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| Which switch port error is an indication of duplex mismatches on 10/100/1000 IEEE 802.3u Gigabit Ethernet ports? | Multiple collisions
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| Which three options are features of VTP version 3? | 1 VTPv3 supports private VLAN mapping
2 VTPv3 uses a primary server concept to avoid configuration revision issues
3 VTPv3 has a hidden password option
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| Which two are contained in a VTP summary advertisement? | 1 Configuration revision number
2 VTP domain name
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| Which two combinations are valid LACP configurations that will set up an LACP channel? | 1 Passive-active
2 active-active
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| 802.1Q trunk is not coming up between two switches. No physical issues. What are two possible causes? | 1 Incorrect VTP domain.
2 Incorrect VTP password.
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| Trying to add a switch. 802.1 Q not coming up. In the lab it worked fine. Three possible causes? | 1 The trunking configuration mode on switch 1 is set to off
2 There is a VTP domain name mismatch
3 Switch 1 does not support 802.1 Q
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| Which three combinations are valid LACP configurations that will set up a channel? | 1 On-on
2 Passive-Active
3 Active-Active
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| Mathematical relationship between the committed information rate(CIR), Committed Burst,(Bc) and Committed rate measurement interval (Tc)? | Tc=Bc/CIR
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| When using extended system ID in 802.1d, how many bits are reserved for the field? | 12
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| Two used in the selection of a root bridge in a Spanning Tree Protocol IEEE 802.1 D? | 1 Bridge ID priority
2 Bridge ID MAC address
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| Which two options are contained in a VTP subnet advertisement? | 1 VLAN information
2 Sequence number
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| Which two statements are true about 802.1s? | 1 802.1s supports number spanning-tree instances?
2 The CPU utilization for 802.1s is lower than the CPU utilization for 802.1w
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| In 802.1s, how is the VLAN to instance mapping represented in the BPDU? | The VLAN to instance mapping is a 16-byte MD5 signature field in the MST BPDU.
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| Which two combinations are valid PAgP configurations that will set up a PAgP channel? | 1 Desirable-Auto
2 Desirable-Desirable
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| Admin wants to enable Etherchannel between two switches in the "on" mode. How can he avoid a problem? | 1 Configure the Etherchannel as "desirable" first
2 Disable all interfaces first
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| Which two statements are true about the role of split horizon? | 1 It is a function that prevents the adverting of routes over the interface that the router is using to reach a route.
2 Its function is to help avoid routing loops
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| Two bridges competing for root bridge of a 802.1D Spanning tree. Both have the same bridge priority. Which one wins? | MAC address
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| What does the "root guard" feature provide in a bridged network? | It enforces the root bridge placement in the network.
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| What are the port roles described by 802.1w? | Root port ,designated port, alternate port, backup port, and disabled.
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| Which statement is true about shaping? | Shaping supports queuing of excess traffic
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| You are configuring an 802.1Q trunk between a layer 2 switch and a firewall. documentation says dynamic desirable. does not function. | The firewall does not support DTP. You should set the switchport trunk mode to ON.
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| If a Cisco switch is configured with VTPv1 in transparent mode, what is done with received VTP advertisements? | The contents are ignored and they are forwarded out all trunking ports.
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| What is the purpose of the STP Portfast BPDU guard feature? | Enforce the borders of an STP domain.
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| Which three of these statements about Dynamic Trunking protocol are correct? | 1 It supports autonegotiation for both ISL and 802.1Q trunks
2 It must be disabled on an interface if you do not want the interface to work as a trunk or start negotiation to become a trunk
3 It is a point-to-point protocol
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| Which two statements describe spanning-tree BPDU processing for a blocking port? | 1 BPDUs that enter a blocking port are processed
2 Loopguard puts an interface into a loop-inconsistent state when BPDUs stop being received on a blocking port.
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| Which statement is true about TCN propagation? | A TCN is generated and sent to the root bridge.
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| The classic Spanning-tree Protocol(802.1D 1998) uses which sequence of variables t determine the best received BPDU? | 1)Lowest root bridge ID, 2)Lowest root path ID, 3)Lowest sender bridge ID, 4) Lowest sender port ID
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| Which configuration is used to enable root guard? | interface gig3/1
spanning-tree guard root
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| When STP UplinkFast is enabled on a switch utilizing the default bridge priority, what will the new bridge priority be changed to? | 49152
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| On what type of ports would STP Port Fast BPDU guard be most appropriate? | Host ports
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| Prior to 802.1w, Cisco implemented a number of proprietary enhancements to 802.1D to improve convergence in a layer 2 network. Which statement is correct? | Portfast, UplinkFast, and BackboneFast are specified in 802.1w
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| Your network is suffering from regular outages. After troubleshooting, you learn that the transmit lead of a fiber uplink was damaged. Prevent in the future. | 1 loopguard
2 UDLD
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| which three can be achieved by Cisco PVST+? | 1 Load balancing
2 Backbone, Uplink and portfast
3 root, loop and BPDU guard
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| Your Network is very slow. Your CAM table is full. 12000 MAC address Prevent this from Happening | Configure Port security.
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| What statement is true about TCN propagation in RSTP(802.1w) | The originator of the TCN immediately through the network.
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| Which load-balance algorithm can you use in the switch in order to optimize this load balancing? | 1 source IP address
2 Destination IP address
3 destination MAC address
4 Source MAC address
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| Which three are true about cisco Spanning-tree features? | 1 STP BPDUs are relayed by all non-root bridges and RSTP BPDUs are generated by each bridge
2 RSTP can only achieve rapid transition to forwarding on edge ports and on point-to-point kinks
3 RPVST+ and RSTP are both based upon the IEEE 802.1ww specs
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| What two statement are true about PAgP? | 1 PAgP uses the same multicast group MAC address as Cisco Discovery Protocol
2 The PAgP protocol value is 0x0104
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| Under which two circumstances would an RSTP bridge flush it's CAM table? | 1 upon receiving a topology change notification
2 when transitioning from discarding to forwarding
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| Which command is used to enable EtherChannel hashing for layer 3 IP and Layer 4 port-based CEF? | Port-channel load balance
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| Which of these correctly identifies a difference between the way BPDUs are handled by 802.1 w and 802.1 D? | 802.1D bridges only rely BPDUs received from the root.
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| Which two solutions would allow for more bandwidth for an application? | 1 Have the application recoded to use multiple connections instead of a single connection so EtherChannel can better load balance the traffic
2 Upgrade the Etherchannel bundle to a single gigabit link.
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| Which statement is true about loop guard? | Loop guard only operates on interfaces that are considered point-to-point by the spanning tree
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| Admin followed the correct procedure. What would be a possible cause of a problem? | Erasing VLAN's increases the VTP configuration revision.
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| For the following ports, which port is on every bridge in a Spanning tree Protocol IEEE 802.1w network except the root bridge? | root port
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| Which two attributes need to match for two switches to become members of the same MST region? | 1 The table of 4096 elements that map the respective VLAN to STP instance number
2 Configuration revision number
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| For the following LMI types, which three can be configured for use with Frame Relay on a Cisco router? | 1 Cisco
2 Ansi-Annex D
3 Q9330Annex A
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| Which two are natively included bt the IEEE 802.1w Standard? | 1 fast transition to forwarding state.
2 Backbone,uplink and portfast
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| In which two spanning-tree states is the port learning MAC addresses? | 1 learning
2 forwarding
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| Each location has only one physical link to the cloud. No connection between B and C. | Use Frame-relay IETF encapsulation on a per-VC basis on the central office router.
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| Which of these statements regarding port states is true of both 802.1D and 802.1w | The 802.1 D port states Disabled, Blocking and listening have become the 802.1w port states and all other 802,1D port states remain the same in 802.1w
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| Which of these best describes the action taken when VTP message is received on a switch in VTP mode Transparent? | VTP updates are ignored and forwarded out trunks only
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| Phase I and Phase II DMVPN differ in terms of which characteristics? | Utilization of spoke-to-spoke dynamic tunnels
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| why does RSTP have a better convergence time than 802.1 D? | it is not timer-based
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| A user has no network connectivity. A check of the associated ports indicates that the interface is up, the line protocol is down. Which item would most likely cause problem? | Speed Mismatch
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| If a port configured with STP loop guard stops receiving BPDUs, the port will be put into which state? | loop-inconsistent state.
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| In layer 2 topologies, Spanning-tree failures can cause loops in the network. These unblocked loops can cause network failures because of excessive traffic. Two features used to limit. | 1 storm control
2 Broadcast suppression
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