01. Refer to the exhibit. All switches in the network have empty MAC tables. STP has been disabled on the switches in the network. How will a broadcast frame that is sent by host PC1 be handled on the network?
- Switch SW1 will block the broadcast and drop the frame.
- Switch SW1 will forward the broadcast out all switch ports, except the originating port. This will generate an endless loop in the network.
- Switch SW1 will forward the broadcast out all switch ports, except the originating port. All hosts in the network will reply with a unicast frame sent to host PC1.
- Switch SW1 will forward the traffic out all switch ports except the originating port as a unicast frame. All hosts in the network will reply with a unicast frame sent to switch SW1.
02. Refer to the exhibit. Server sends an ARP request for the MAC address of its default gateway. If STP is not enabled, what will be the result of this ARP request?
- Router_1 will drop the broadcast and reply with the MAC address of the next hop router.
- Switch_A will reply with the MAC address of the Router_1 E0 interface.
- Switch_A and Switch_B will continuously flood the message onto the network.
- The message will cycle around the network until its TTL is exceeded.
- one root bridge per network
- all non-designated ports forwarding
- one root port per non-root bridge
- multiple designated ports per segment
- one designated port per network
- bridge priority
- switching speed
- number of ports
- base MAC address
- switch location
- memory size
- to negotiate a trunk between switches
- to set the duplex mode of a redundant link
- to identify the shortest path to the root bridge
- to prevent loops by sharing bridging tables between connected switches
- to determine which ports will forward frames as part of the spanning tree
- They are sent out by the root bridge only after the inferior BPDUs are sent.
- They consist of a bridge priority and MAC address.
- Only the root bridge will send out a BID.
- They are used by the switches in a spanning tree topology to elect the root bridge.
- The switch with the fastest processor will have the lowest BID.
- Spanning tree blocks Gi0/1 on S3.
- Gi0/2 on S3 transitions to a root port.
- Port priority makes Gi0/2 on S1 a root port.
- S4 is already the root bridge, so there are no port changes.
- blocking
- learning
- disabling
- listening
- forwarding
- the max-age timer
- the spanning-tree hold down timer
- the forward delay
- the spanning-tree path cost
- the blocking delay
- PortFast is Cisco proprietary.
- PortFast can negatively effect DHCP services.
- PortFast is used to more quickly prevent and eliminate bridging loops.
- Enabling PortFast on trunks that connect to other switches improves convergence.
- If an access port is configured with PortFast, it immediately transitions from a blocking to a forwarding state.
- election of the root bridge
- blocking of the non-designated ports
- selection of the designated trunk port
- determination of the designated port for each segment
- Configure all the interfaces on the switch as the static root ports.
- Change the BPDU to a lower value than that of the other switches in the network.
- Assign a lower IP address to the switch than that of the other switches in the network.
- Set the switch priority to a smaller value than that of the other switches in the network.
- STP and RSTP have the same BPDU format and flag field information.
- STP specifies backup ports. RSTP has only root ports, alternate ports, and designated ports.
- STP port states are independent of port roles. RSTP ties together the port state and port role.
- STP waits for the network to converge before placing ports into forwarding state. RSTP places designated ports into forwarding state immediately.
- bridge priority
- MAC address
- protocol
- VLAN ID
- immediately loses its edge status
- inhibits the generation of a TCN
- goes immediately to a learning state
- disables itself
- becomes a normal spanning-tree port
- shared
- end-to-end
- edge-type
- boundary-type
- point-to-many
- point-to-point
- RSTP uses a faster algorithm to determine root ports.
- RSTP introduced the extended system ID to allow for more than 4096 VLANs.
- Both RSTP and STP use the portfast command to allow ports to immediately transition to forwarding state.
- Like STP PortFast, an RSTP edge port that receives a BPDU loses its edge port status immediately and becomes a normal spanning-tree port.
- Configuration commands to establish primary and secondary root bridges are identical for STP and RSTP.
- Because of the format of the BPDU packet, RSTP is backward compatible with STP.
- The root switch is the switch with the highest speed ports.
- Decisions on which port to block when two ports have equal cost depend on the port priority and identity.
- All trunking ports are designated and not blocked.
- Root switches have all ports set as root ports.
- Non-root switches each have only one root port.
19. Refer to the exhibit. What can be determined from the output shown?
- Two hosts communicating between ports Fa0/2 and Fa0/4 have a cost of 38.
- The priority was statically configured to identify the root.
- STP is disabled on this switch.
- The timers have been altered to reduce convergence time.
- alternate
- backup
- designated
- edge
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