Cisco exam -- redundant network

1 Which of the following three parts can be combined to form a bridge ID？

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• • expenses
  • port ID
  • MAC Address
  • Bridge priority
  • Expansion system ID
  • IP Address

In which two port states are the exchange opportunities obtained PVST Network MAC Address and process BPDU？（ Please choose two .）

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• • monitor
  • forward
  • Blocking
  • Ban
  • Informed

Which two network design functions need spanning tree protocol (STP) To ensure correct network operation ？（ Please choose two .）

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• • Static default routing
  • The implementation of VLAN To include broadcasts
  • Eliminate multiple 2 Single point of failure of layer switch
  • Link state dynamic routing that provides redundant routing
  • The first 2 Redundant links between layer switches

The first 2 What is the result of the layer broadcast storm ？

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• • CSMA/CD Each host will continue to transmit frames .
  • When the switch is congested , The router will take over the role of forwarding frames .
  • ARP The broadcast request is returned to the sender's host .
  • The new traffic will be discarded by the switch because it cannot be processed .

Issue on the switch show spanning-tree vlan 33 After the command , The three ports show the forwarding status . Which two port roles can these interfaces perform in the forwarding state ？ （ Please choose two .）

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• • root
  • Blocking
  • Appoint
  • spare
  • Ban

LAN A group of switches are connected in the topology . Which one? STP The bridge priority value is unlikely to be selected as the root switch ？

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• • 61440
  • 65535
  • 4096
  • 32768

In a scalable network ,STP What is the function of ？

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• • Disable redundant paths , To eliminate the 2 Layer loop .
  • Protect the edge of enterprise network from malicious activities .
  • Reduce the size of the fault domain , To curb the impact of the failure .
  • Combine multiple switch trunk links , As a logical link to increase bandwidth .

Which spanning tree standard supports only one root bridge , So that all VLAN All traffic flows through the same path ？

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• • 802.1D
  • PVST+
  • Fast PVST
  • MST

Spanning tree protocol (STP) What is the role of ？

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• • Enable Cisco devices to exchange routing table updates
  • Prevent router's routing loop
  • Create smaller conflict domains
  • Prevent section 2 Layer loop
  • Create smaller broadcast domains

In which two kinds PVST+ Learn in port state MAC Address ？（ Choose two .）

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• • Blocking
  • Listen
  • disabled
  • forward
  • learning

See illustration . After the selection process , Which switch will become the root bridge ？

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• • S1
  • S2
  • S3
  • S4

Which role should be assigned to the switch port with the lowest overhead to reach the root bridge ？

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• • Disable port
  • Root port
  • Designated port
  • Non specified port

A small company network has six interconnected nodes 2 Layer switch . At present, all switches use 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 ？

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• • 1
  • 28672
  • 32768
  • 34816
  • 61440

See illustration . The administrator tries to use the command as shown in the figure in S1 And the other two switches EtherChannel, But it didn't work . What's the problem ？

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• • If in the first place 3 Layer switch EtherChannel, Traffic can only be sent to two different switches .
  • Traffic cannot be sent to two different switches , But it can only be sent to two different devices , For example, enable EtherChannel Servers and switches .
  • If implemented on Gigabit Ethernet interface EtherChannel, Traffic can only be sent to two different switches .
  • Cannot pass the same EtherChannel The link sends traffic to two different switches .

The following are related to the use PAgP establish EtherChannel In other words , Which one is right ？

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• • It will increase the number of ports participating in the spanning tree .
  • It is better than LACP Need more physical links .
  • It requires full duplex .
  • It uses an even number of ports when aggregating （2、4、6 etc. ）.
  • It is a Cisco proprietary agreement .

See illustration . According to the output shown in the figure , About EtherChannel What conclusion can bag draw ？

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• • EtherChannel Wrapped in the second 2 Tier and tier 3 Layer operation .
  • EtherChannel Package closed .
  • Two Gigabit Ethernet ports are used to form EtherChannel.
  • Cisco proprietary agreements are used for negotiation EtherChannel link .

EtherChannel What are the two load balancing methods in technology ？（ Please choose two .）

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• • Source MAC and IP And purpose MAC and IP The combination of
  • Source IP To the end IP
  • Source MAC To the end MAC
  • Source port and IP With destination port and IP The combination of
  • Source port and destination port

See illustration . Switch S1 and S2 ... is configured between EtherChannel, But the interface is not formed EtherChannel. What's the problem ？

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• • EtherChannel Not configured to be the same as allowed on each interface VLAN Range .

Which two channel group modes will make the interface use PAgP Enter the negotiation status ？（ Please choose two .）

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• • passive
  • Take the initiative
  • Automatically
  • expect
  • Turn on

See illustration . The network administrator is working on two switches （SW1 and SW2） Configure an Ethernet channel link between . Which of the following statements describes in SW1 and SW2 The effect of entering these commands on ？

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• • SW2 After initiating the link request, the Ethernet channel will be established .
  • The Ethernet channel cannot be established .
  • The Ethernet channel is directly established without negotiation .
  • SW1 After initiating the link request, the Ethernet channel will be established .

See illustration . The network administrator is working on two switches （SW1 and SW2） Configure an Ethernet channel link between . however , Ethernet channel link cannot be established . What changes to the configuration can solve this problem ？

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• • To configure SW2 , Set the mode of Ethernet channel mode to auto.
  • To configure SW2 , Set the mode of Ethernet channel mode to desirable.
  • To configure SW2 , Set the mode of Ethernet channel mode to on.
  • To configure SW1 , Set the mode of Ethernet channel mode to on.

Which statement describes EtherChannel Characteristics of ？

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• • It includes multiple parallel links between switches and routers .
  • It is composed of multiple physical links between two switches, which are regarded as a link .
  • It can be bundled with mixed types 100 Mb/s and 1Gb/s Ethernet link .
  • It can be combined up to 4 Physical links .

The network administrator is using commands SW1(config-if-range)# channel-group 1 mode auto To configure the switch SW1 and SW2 Between EtherChannel link . Must be in SW2 Which command is used on to enable this EtherChannel？

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• • SW2(config-if-range)# channel-group 1 mode active
  • 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

Which technology is an open protocol standard that enables switches to automatically bind physical ports to a single logical link ？

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• • LACP
  • DTP
  • PAgP
  • Multiple links PPP

Configure trunking between two switches EtherChannel What are your requirements ？

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• • Two switches VLAN The allowable range of must be the same .
  • The participating interface must be located in the same module on the switch .
  • The participating interfaces on both switches must be assigned the same VLAN Number .
  • The participating interfaces must be physically continuous on the switch .

EtherChannel What are the two advantages ？（ Please choose two .）

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• • EtherChannel Use upgraded physical links to provide higher bandwidth .
  • Configuration is different EtherChannel Can realize load balancing on the link of .
  • To configure EtherChannel The interface can make the configuration of the physical link consistent .
  • The spanning tree protocol will EtherChannel The physical link in is regarded as a logical connection .
  • The spanning tree protocol passes EtherChannel The interface that fails in the changes to the forwarding state to ensure redundancy .

The switch is configured to run STP. Which of the following terms describes a default value of 32,768 Field of , And this field will be used as the initial determinant when electing the root bridge ？

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• • bridge ID
  • Expansion system ID
  • Bridge priority
  • MAC Address

See illustration . In the activation of RSTP In the network , port A、B、C and D What are the possible port roles ？

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• • spare 、 Appoint 、 root 、 root
  • Appoint 、 replace 、 root 、 root
  • Appoint 、 root 、 replace 、 root
  • replace 、 root 、 Appoint 、 root

See illustration . Which switching technology allows the link aggregation of each access layer switch , Thus, in every stage 2 Layer switch and layer 3 Provide more bandwidth between layer switches ？

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• • relay
  • EtherChannel
  • HSRP
  • PortFast

See illustration . The administrator wants to use the port aggregation protocol to form EtherChannel. If the switch S1 Configure to automatic mode , that S2 What mode should be configured to form EtherChannel？

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• • close
  • expect
  • Turn on
  • Automatically

open PT practice . Perform the tasks in the exercise instructions , Then answer the question . stay SW1 What commands are entered on , Can be in SW1 and SW2 Successfully establish the Ethernet channel link between .

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• • interface GigabitEthernet0/1
    channel-group 1 mode desirable
  • interface GigabitEthernet0/1
    no shutdown
  • interface Port-channel 1
    no shutdown
  • interface GigabitEthernet0/2
    channel-group 2 mode desirable

If PVST Bridge priority is not configured in , So what conditions will be considered when electing the root bridge ？

The minimum MAC Address

Which of the following characteristics does a spanning tree have ？

By default, spanning trees are enabled on Cisco switches .

Which of the following protocols provides up to 16 individual RSTP example , It can integrate multiple with the same physical and logical topology VLAN Combine into one RSTP example , And for PortFast、BPDU Protection and BPDU Filter 、 Root protection and loop protection provide support ？

MST

Used to determine which port on the non root bridge will become STP What is the value of the root port in the network ？

Path overhead

Close the spanning tree and provide a pass through 2 What are the two disadvantages of multiple paths in a layer switch network ？（ Choose two .）

• Broadcast frames will be transmitted indefinitely .
• MAC The address table will become unstable

Configure between two switches EtherChannel What are the two necessary conditions for ？（ Please choose two .）

• All interfaces should run in the same duplex mode .
• All interfaces should run at the same speed .

EtherChannel What are the two load balancing methods in technology ？（ Please choose two .）

Source MAC To the end MAC

Source IP To the end IP

To configure EtherChannel when , Which mode will make the interface enter the port channel , Without exchanging aggregation protocol packets ？

Turn on

Which mode configuration settings can be set in the switch SW1 and SW2 Between the formation of EtherChannel link , Without sending negotiation traffic ？

SW1：on
SW2：on

A network administrator configures a with three interfaces between two switches EtherChannel link . If one of the three interfaces is closed , What will happen ？

The remaining two interfaces continue to load balanced traffic

Use LACP What are the two advantages ？（ Choose two .）

• It supports the use of devices from multiple manufacturers .
• It allows directly connected switches to negotiate Ethernet channel links .

The switch is configured to run STP. Which of the following terms is used to describe specifying VLAN ID Field of ？

Expansion system ID

Which two parameters of the ports of two switches must match to create EtherChannel PAgP？（ Please choose two .）

• Speed
• VLAN Information

See illustration . Network administrator on switch S1 Issued on show etherchannel summary command . What conclusion can be drawn ？

EtherChannel Not working properly .

Which statement correctly describes EtherChannel The implementation of ？

• The relay port can be EtherChannel Part of the bundle .

The network administrator has passed four TRUNK Between the two switches connected by the link EtherChannel. If one of them TRUNK The interface of the link becomes down state , be EtherChannel What's going to happen ？

qu-1655979771261)] Expansion system ID

Which two parameters of the ports of two switches must match to create EtherChannel PAgP？（ Please choose two .）

Speed
VLAN Information

See illustration . Network administrator on switch S1 Issued on show etherchannel summary command . What conclusion can be drawn ？

EtherChannel Not working properly .

Which statement correctly describes EtherChannel The implementation of ？

The relay port can be EtherChannel Part of the bundle .

The network administrator has passed four TRUNK Between the two switches connected by the link EtherChannel. If one of them TRUNK The interface of the link becomes down state , be EtherChannel What's going to happen ？

EtherChannel Will remain in normal operation .