Category Archives: Cisco

CCENT CCNA CCNA routing and switching Certificate Cisco

Which of the following VTP modes allow VLANs to be configured on a switch?

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Which of the following VTP modes allow VLANs to be configured on a switch?

  • 1-  Client-Server
  • 2- Client
  • 3- Server
  • 4- Transparent


  • The correct answer is:

  • 1-  Client-Server 
  • 4- Transparent 
  • SW1(config)#vlan 1005
    VTP VLAN configuration not allowed when device is in CLIENT mode.
    SW1(config)#

    VTP mode are:
    SW1(config)#vtp mode ?
    client Set the device to client mode.
    server Set the device to server mode.
    transparent Set the device to transparent mode.
    .

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    An junior engineer is tasked with creating a new VLAN for Marketing-department on a VTP-enabled switch, SW1, but when he attempts the vlan 1005, he is given an error message; which option indicates a possible reason for this error message?

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    An junior engineer is tasked with creating a new VLAN for Marketing-department on a VTP-enabled switch, SW1, but when he attempts the vlan 1005, he is given an error message; which option indicates a possible reason for this error message?

  • 1- The switch SW1 is configured in VTP client mode.
  • 2- The switch SW1 is configured in VTP transparent mode.
  • 3- The switch SW1 is configured with a mismatched VTP domain.
  • 4- The switch SW1 is configured with a mismatched VTP password.


  • The correct answer is:

  • 1- The switch SW1 is configured in VTP client mode. 
  • SW1(config)#vlan 1005
    VTP VLAN configuration not allowed when device is in CLIENT mode.
    Common Cisco VTP Troubleshooting Issues.

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    CCENT CCNA CCNA routing and switching Certificate Cisco

    Two switches are connected. which of the following are accurate?

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    Two switches are connected. which of the following are accurate?

  • 1- Dynamic desirable and dynamic auto will end up in a trunk being formed.
  • 2- Trunk and dynamic auto will end up in a trunk being formed.
  • 3- Dynamic auto and dynamic auto will end up in a dynamic trunk being negotiated.
  • 4- Access and trunk would end up in a not forming atrunk.


  • The correct answer is:

  • 1- Dynamic desirable and dynamic auto will end up in a trunk being formed. 
  • 3- Dynamic auto and dynamic auto will end up in a dynamic trunk being negotiated. 
  • 4- Access and trunk would end up in a not forming atrunk. 
  • Find out the DTP negotiated interface modes
    If one of the interface is setup to DTP as Access y another is Trunk that will end up to limited connectivity.
    DTP negotiated interface modes
    .

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    CCENT CCNA CCNA routing and switching Certificate Cisco

    What is true about the command switchport nonegotiate?

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    What is true about the command switchport nonegotiate?

  • 1- This is on by default.
  • 2- This will cause DTP packets to be sent, preventing a trunk from being negotiated.
  • 3- Using this command prevents a switchport from being a trunk port.
  • 4- When used, if a connected switch is using dynamic desirable or dynamic auto, it will not form a trunk.


  • The correct answer is:

  • 4- When used, if a connected switch is using dynamic desirable or dynamic auto, it will not form a trunk. 
  • Trying to use the command switchport nonegotiate when the switchport is configured as dynamic:
    SW1(config-if-range)#switchport nonegotiate
    Command rejected: Conflict between ‘nonegotiate’ and ‘dynamic’ status.
    When the port is configured as “access”, now is the nonegotiate will be accepted.
    SW1(config-if-range)#switchport mode access
    SW1(config-if-range)#switchport nonegotiate
    .

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    200-105 Interconnecting Cisco Networking Devices part 2 CCNA CCNA R&S CCNA routing and switching Certificate Certifications Cisco Cisco Certified Network Associate v3.0 (200-125) Cisco Lab CCNA Common commads router Spanning-tree protocol Spanning-Tree Protocols

    Spanning-Tree,spt process explained, LAN switching

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    Spanning-Tree,spt process explained, LAN switching

    1.  Election of a root bridge
    2. Election of a root port for each non-root switch
    3. Election of designated port for each segment
    4. Port transition to forwarding or blocking state.
    Spanning-Tree,spt process explained, LAN switching

    In a layer 2 switched LAN, all links are running at 100 Mbps. STP uses all default port cost configuration.

    1- Election of a root bridge.
    1.1 The switch with the lowest bridge ID. You can have ONLY one root bridge by broadcast domain.
    This example

     Switch  SW1  SW2  SW3 SW4 VLAN
     Priority 32769 32769 32769 32769 1
     MAC address 00D0.D37C.B651 0050.0FC8.74DB 0090.2B8C.C439 0007.EC41.0465 1

    From the table above you can noticed that  all the switches have the same bridge priority(the default value:32769), so the priority is tied, so check the next condition

    “Lowest MAC address will be the root bridge”

    1.2 The switch with lowest MAC address will be the Root Bridge. Again from the table above, the lowest MAC address of the 4 switches is switch SW4 with MAC address of 0007.EC41.0465,

    The switch SW4 is the root bridge for the VLAN 1, because it has the lowest MAC address(0007.EC41.0465)

     

    Go up

    2- Election of root port. The root port is that used by the rest of switches in the STP to reach the switch that is elected as root bridge.

    Every non-root switch(SW1,SW2,and SW3) will have a root.

    SW2’s Fa04 and SW1’s Fa0/4 all receive a zero-cost BPDU from the root switch SW4, making them a root port each switch.

    The determine to root port with lowest cost back to the root bridge. For example here is the process to election the root port on switch 1, from the image of network diagram the switch SW1 has connected to LAN

    All links are FastEthernet running at 100 Mbps, with default port cost of 19

     Port Cost to reach root bridge(SW4)
     FastEthernet0/2  38
     FastEthernet0/3 38
     FastEthernet0/4 19
     FastEthernet0/11  No participated in STP is acces port

    The port FastEthernet 0/4 will be the root port, because it has the lowest root cost

    SW1#show spanning-tree interface FastEthernet 0/4
    Vlan Role Sts Cost Prio.Nbr Type
    —————- —- — ——— ——– ——————————–
    VLAN0001 Root FWD 19 128.4 P2p

    Finally, the show spanning-tree vlan 1
    SW1#show spanning-tree vlan 1
    VLAN0001
    Spanning tree enabled protocol ieee
    Root ID Priority 32769
    Address 0007.EC41.0465
    Cost 19
    Port 4(FastEthernet0/4)
    Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

    Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)
    Address 00D0.D37C.B651
    Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
    Aging Time 20

    Interface Role Sts Cost Prio.Nbr Type
    —————- —- — ——— ——– ——————————–
    Fa0/11 Desg FWD 19 128.11 P2p
    Fa0/3 Desg FWD 19 128.3 P2p
    Fa0/4 Root FWD 19 128.4 P2p
    Fa0/2 Altn BLK 19 128.2 P2p

    Go up
    3-Election of Designated port by segment. Is the port with lowest cost to reach the root bridge.

    The ports of the switch elected as root bridge are automatically elected as Designated for their segment.

    4- Port transition to forwarding or blocking. The designated and root ports will pass to forwarding state and the rest of the ports will be blocked for sending and receiving frames.

    Spanning-Tree,spt process explained, LAN switching
    Interface Role Sts Cost Prio.Nbr Type
    SW3
    Fa0/1 Altn BLK 19 128.1 P2p
    Fa0/2 Root FWD 19 128.2 P2p
    Fa0/13 Desg FWD 19 128.13 P2p

    SW1
    Fa0/2 Altn BLK 19 128.2 P2p
    Fa0/3 Desg FWD 19 128.3 P2p
    Fa0/4 Root FWD 19 128.4 P2p
    Fa0/11 Desg FWD 19 128.11 P2p

    SW2
    Fa0/4 Root FWD 19 128.4 P2p
    Fa0/1 Desg FWD 19 128.1 P2p
    Fa0/3 Desg FWD 19 128.3 P2p
    Fa0/12 Desg FWD 19 128.12 P2p
    Fa0/24 Desg FWD 19 128.24 P2p

    SW4
    Fa0/1 Desg FWD 19 128.1 P2p
    Fa0/2 Desg FWD 19 128.2 P2p
    Fa0/14 Desg FWD 19 128.14 P2p
    Go up

    Download a lab used to explain the spanning-tree process or practice the CCNA exam online
    Download example spanning-tree(SPT), LAN switching, Cisco CCNA&RS (114 downloads)

     

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    Which of the following would be in a forwarding state in STP?

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    Which of the following would be in a forwarding state in STP?

  • 1- Blocking ports after convergence
  • 2- Designated ports
  • 3- The root port on a non-root switch
  • 4- The root ports on the root switch


  • The correct answer is:

  • 2- Designated ports 
  • 3- The root port on a non-root switch 
  • The show spanning-tree
    SW1#show spanning-tree
    VLAN0001
    Spanning tree enabled protocol ieee
    Root ID Priority 32769
    Address 0007.EC41.0465
    Cost 19
    Port 4(FastEthernet0/4)
    Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

    Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)
    Address 00D0.D37C.B651
    Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
    Aging Time 20

    Interface Role Sts Cost Prio.Nbr Type
    —————- —- — ——— ——– ——————————–
    Fa0/11 Desg FWD 19 128.11 P2p
    Fa0/3 Desg FWD 19 128.3 P2p
    Fa0/4 Root FWD 19 128.4 P2p
    Fa0/2 Altn BLK 19 128.2 P2p

    The port role Altn(alternate) has a block state.
    The root switch has only designated port, it will never a be root port on this type of switch.
    .

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    What is the maximum number of VLANs that are supported on a higher-end Cisco switch using 802.1Q?

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    What is the maximum number of VLANs that are supported on a higher-end Cisco switch using 802.1Q?

  • 1- 1001
  • 2- 1005
  • 3- 4094
  • 4- 4096


  • The correct answer is:

  • 3- 4094 
  • The normal-range VLANs (VLAN IDs 1 to 1005) and extended-range VLANs (VLAN IDs 1006 to 4094) on the Catalyst 3750-X or 3560-X switch. The maximum number of VLANs that can be addressed using the 802.1Q tag is 4096, two of which are considered reserved (0 and 4095), for a total of 4094.
    Maximum VLAN tag per 802.1Q trunk, cisco.

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    What is the correct order for the following steps in the spanning-tree algorithm? I: Election of a designated port for each segment. II: Election of a root port for each non-root switch. III: Root ports and designated ports transition to the forwarding state. IV: Elect a root bridge.

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    What is the correct order for the following steps in the spanning-tree algorithm?

    I: Election of a designated port for each segment.
    II: Election of a root port for each non-root switch.
    III: Root ports and designated ports transition to the forwarding state.
    IV: Elect a root bridge.

  • 1- I-II-III-IV
  • 2- II-IV-III-I
  • 3- IV-I-II-III
  • 4- IV-II-I-III


  • The correct answer is:

  • 4- IV-II-I-III 
  • The correct order is

    IV – Election of a root bridge
    II – Election of a root port for each non-root switch
    I – Election of designated port for each segment
    III – Port transition to forwarding or blocking state.

    STP, process.

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    Which of the following Internet edge designs include connections to two ISPs?

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    Which of the following Internet edge designs include connections to two ISPs?

  • 1- Dual homed
  • 2- Dual multihomed
  • 3- Single homed
  • 4- Single multihomed


  • The correct answer is:

  • 2- Dual multihomed  
  • 4- Single multihomed  
  • multihomed refers to designs in which the enterprise connects to (at least) two ISPs. “single homed”, “dual homed”,”single multi-homed” or “dual multi-homed”. These are different design topologies where we describe how a customer is connected (using BGP) to one or more ISPs..

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    Which of the following represents the total cost between the device forwarding a BPDU and the switch in STP that has the lowest BID?

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    Which of the following represents the total cost between the device forwarding a BPDU and the switch in STP that has the lowest BID?

  • 1- Forward delay
  • 2- Root bridge ID
  • 3- Sender’s bridge ID
  • 4- Sender’s root cost


  • The correct answer is:

  • 4- Sender’s root cost 
  • The STP cost between the switch that is advertising the STP BPDU and the root of STP is the sender’s root cost.
    STP, election of the Root bridge.

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