Ch 5-6 Cisco Test
15. What is the value used to determine which port on a non-root bridge will become a root port in a STP network? the path cost the highest MAC address of all the ports in the switch the lowest MAC address of all the ports in the switch the VTP revision number
a
39. Which port role is assigned to the switch port that has the lowest cost to reach the root bridge? designated port disabled port root port non-designated port
c
37. A set of switches is being connected in a LAN topology. Which STP bridge priority value will make it least likely for the switch to be selected as the root? 65535 4096 32768 61440
d
26. A network administrator configured an EtherChannel link with three interfaces between two switches. What is the result if one of the three interfaces is down? The remaining two interfaces continue to load balance traffic. The remaining two interfaces become separate links between the two switches. One interface becomes an active link for data traffic and the other becomes a backup link. The EtherChannel fails.
a
40. A switch is configured to run STP. What term describes the switch port closest, in terms of overall cost, to the root bridge root port designated port alternate port disabled
a
27. A network administrator is configuring an EtherChannel link between switches SW1 and SW2 by using the command SW1(config-if-range)# channel-group 1 mode auto . Which command must be used on SW2 to enable this EtherChannel? SW2(config-if-range)# channel-group 1 mode passive SW2(config-if-range)# channel-group 1 mode desirable SW2(config-if-range)# channel-group 1 mode on SW2(config-if-range)# channel-group 1 mode active
b
38. In which two PVST+ port states are MAC addresses learned? (Choose two.) learning forwarding disabled listening blocking
ab
1. What additional information is contained in the 12-bit extended system ID of a BPDU? MAC address VLAN ID IP address port ID
b
4. Which two concepts relate to a switch port that is intended to have only end devices attached and intended never to be used to connect to another switch? (Choose two.) bridge ID edge port extended system ID PortFast PVST+
bd
48. Which two channel group modes would place an interface in a negotiating state using PAgP? (Choose two.) on desirable active auto passive
bd
10. When the show spanning-tree vlan 33 command is issued on a switch, three ports are shown in the forwarding state. In which two port roles could these interfaces function while in the forwarding state? (Choose two.) alternate designated disabled blocked root
be
12. What is a characteristic of spanning tree? It is enabled by default on Cisco switches. It is used to discover information about an adjacent Cisco device. It has a TTL mechanism that works at Layer 2. It prevents propagation of Layer 2 broadcast frames.
a
29. What is a requirement to configure a trunking EtherChannel between two switches? The allowed range of VLANs must be the same on both switches. The participating interfaces must be assigned the same VLAN number on both switches. The participating interfaces must be physically contiguous on a switch. The participating interfaces must be on the same module on a switch.
a
42. A switch is configured to run STP. What term describes a field used to specify a VLAN ID? extended system ID port ID bridge priority bridge ID
a
43. A switch is configured to run STP. What term describes the reference point for all path calculations? root bridge root port designated port alternate port
a
44. A switch is configured to run STP. What term describes a field that has a default value of 32,768 and is the initial deciding factor when electing a root bridge? bridge priority MAC Address extended system ID bridge ID
a
49. Which mode configuration setting would allow formation of an EtherChannel link between switches SW1 and SW2 without sending negotiation traffic? SW1: onSW2: on SW1: desirableSW2: desirable SW1: autoSW2: autotrunking enabled on both switches SW1: autoSW2: autoPortFast enabled on both switches SW1: passiveSW2: active
a
8. If no bridge priority is configured in PVST, which criteria is considered when electing the root bridge? lowest MAC address lowest IP address highest IP address highest MAC address
a
32. What are two advantages of EtherChannel? (Choose two.) Spanning Tree Protocol views the physical links in an EtherChannel as one logical connection. Load balancing occurs between links configured as different EtherChannels. Configuring the EtherChannel interface provides consistency in the configuration of the physical links. Spanning Tree Protocol ensures redundancy by transitioning failed interfaces in an EtherChannel to a forwarding state. EtherChannel uses upgraded physical links to provide increased bandwidth.
ac
17. What are two drawbacks to turning spanning tree off and having multiple paths through the Layer 2 switch network? (Choose two.) The MAC address table becomes unstable. The switch acts like a hub. Port security becomes unstable. Broadcast frames are transmitted indefinitely. Port security shuts down all of the ports that have attached devices.
ad
21. What are two requirements to be able to configure an EtherChannel between two switches? (Choose two.) All the interfaces need to work at the same speed. All interfaces need to be assigned to different VLANs. Different allowed ranges of VLANs must exist on each end. All the interfaces need to be working in the same duplex mode. The interfaces that are involved need to be contiguous on the switch.
ad
5. Which three components are combined to form a bridge ID? extended system ID cost IP address bridge priority MAC address port ID
ade
30. What are two advantages of using LACP? (Choose two.) It allows directly connected switches to negotiate an EtherChannel link. It eliminates the need for configuring trunk interfaces when deploying VLANs on multiple switches. It decreases the amount of configuration that is needed on a switch. It provides a simulated environment for testing link aggregation. It allows the use of multivendor devices. LACP allows Fast Ethernet and Gigabit Ethernet interfaces to be mixed within a single EtherChannel.
ae
13. Which spanning tree standard supports only one root bridge so that traffic from all VLANs flows over the same path? PVST+ 802.1D MST Rapid PVST
b
18. A small company network has six interconnected Layer 2 switches. Currently all switches are using the default bridge priority value. Which value can be used to configure the bridge priority of one of the switches to ensure that it becomes the root bridge in this design? 1 28672 32768 34816 61440
b
2. During the implementation of Spanning Tree Protocol, all switches are rebooted by the network administrator. What is the first step of the spanning-tree election process? Each switch with a lower root ID than its neighbor will not send BPDUs. All the switches send out BPDUs advertising themselves as the root bridge. Each switch determines the best path to forward traffic. Each switch determines what port to block to prevent a loop from occurring.
b
28. Which technology is an open protocol standard that allows switches to automatically bundle physical ports into a single logical link? PAgP LACP Multilink PPP DTP
b
3. Which STP port role is adopted by a switch port if there is no other port with a lower cost to the root bridge? designated port root port alternate disabled port
b
31. A switch is configured to run STP. What term describes a non-root port that is permitted to forward traffic on the network? root port designated port alternate port disabled
b
54. What is the outcome of a Layer 2 broadcast storm? Routers will take over the forwarding of frames as switches become congested. New traffic is discarded by the switch because it is unable to be processed. CSMA/CD will cause each host to continue transmitting frames. ARP broadcast requests are returned to the transmitting host.
b
52. What are two load-balancing methods in the EtherChannel technology? (Choose two.) combination of source port and IP to destination port and IP source IP to destination IP source port to destination port combination of source MAC and IP to destination MAC and IP source MAC to destination MAC
be
7. In which two port states does a switch learn MAC addresses and process BPDUs in a PVST network? (Choose two.) disabled forwarding listening blocking learning
be
14. What is the purpose of the Spanning Tree Protocol (STP)? creates smaller collision domains prevents routing loops on a router prevents Layer 2 loops allows Cisco devices to exchange routing table updates creates smaller broadcast domains
c
45. Which statement describes an EtherChannel implementation? EtherChannel operates only at Layer 2. PAgP cannot be used in conjunction with EtherChannel. A trunked port can be part of an EtherChannel bundle. EtherChannel can support up to a maximum of ten separate links.
c
51. When EtherChannel is configured, which mode will force an interface into a port channel without exchanging aggregation protocol packets? active auto on desirable
c
55. Which two network design features require Spanning Tree Protocol (STP) to ensure correct network operation? (Choose two.) static default routes implementing VLANs to contain broadcasts redundant links between Layer 2 switches link-state dynamic routing that provides redundant routes removing single points of failure with multiple Layer 2 switches
ce
11. What is the function of STP in a scalable network? It decreases the size of the failure domain to contain the impact of failures. It protects the edge of the enterprise network from malicious activity. It combines multiple switch trunk links to act as one logical link for increased bandwidth. It disables redundant paths to eliminate Layer 2 loops.
d
47. Which statement describes a characteristic of EtherChannel? It can combine up to a maximum of 4 physical links. It can bundle mixed types of 100 Mb/s and 1Gb/s Ethernet links. It consists of multiple parallel links between a switch and a router. It is made by combining multiple physical links that are seen as one link between two switches.
d
53. Which protocol provides up to 16 instances of RSTP, combines many VLANs with the same physical and logical topology into a common RSTP instance, and provides support for PortFast, BPDU guard, BPDU filter, root guard, and loop guard? STP Rapid PVST+ PVST+ MST
d
56. A network administrator has configured an EtherChannel between two switches that are connected via four trunk links. If the physical interface for one of the trunk links changes to a down state, what happens to the EtherChannel? Spanning Tree Protocol will transition the failed physical interface into forwarding mode. Spanning Tree Protocol will recalculate the remaining trunk links. The EtherChannel will transition to a down state. The EtherChannel will remain functional.
d
23. Which two parameters must match on the ports of two switches to create a PAgP EtherChannel between the switches? (Choose two.) port ID PAgP mode MAC address speed VLAN information
de
20. Which statement is true regarding the use of PAgP to create EtherChannels? It requires full duplex. It increases the number of ports that are participating in spanning tree. It requires more physical links than LACP does. It mandates that an even number of ports (2, 4, 6, etc.) be used for aggregation. It is Cisco proprietary.
e
