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Exam 300-115 topic 4 question 144 discussion

Actual exam question from Cisco's 300-115
Question #: 144
Topic #: 4
[All 300-115 Questions]

A dynamic access port is member of which VLAN by default?

  • A. VLAN 1 is the default VLAN
  • B. Same as the native VLAN
  • C. none until the port VLAN is determined
  • D. VLAN 4096
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Suggested Answer: A 🗳️
by Crosby87 at June 25, 2019, 12:34 a.m.

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tb101
5 years, 1 month ago
Switch#sh int fa 0/1 switchport Name: Fa0/1 Switchport: Enabled Administrative Mode: dynamic auto Operational Mode: static access Administrative Trunking Encapsulation: Operational Trunking Encapsulation: native Negotiation of Trunking: On Access Mode VLAN: 1 (default)
upvoted 1 times
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Bastex
5 years, 5 months ago
Yes, C "A dynamic (nontrunking) port can belong to only one VLAN. When the link comes up, the switch does not forward traffic to or from this port until the port is assigned to a VLAN. The source MAC address from the first packet of a new host on the dynamic port is sent to the VMPS, which attempts to match the MAC address to a VLAN in the VMPS database. If there is a match, the VMPS sends the VLAN number for that port. If there is no match, the VMPS either denies the request or shuts down the port (depending on the VMPS secure mode setting)." https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/12-2/20ew/configuration/guide/config/vmps.html
upvoted 2 times
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johnnyD
5 years, 7 months ago
check output from my switch - the correct answer is C. Port gi0/8 which is set as dynamic access is not assigned to vlan1.
upvoted 3 times
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Crosby87
5 years, 10 months ago
I think C. none until the port VLAN is determined is correct
upvoted 4 times
DimS
5 years, 8 months ago
No. A - is right. By default all unassigned ports of the switch are members of the default VLAN 1.
upvoted 3 times
johnnyD
5 years, 7 months ago
interface GigabitEthernet0/8 switchport access vlan dynamic switchport mode access duplex full spanning-tree portfast edge end VLAN Name Status Ports ---- -------------------------------- --------- ------------------------------- 1 default active 12 LAN_access_ports active 14 IT_department active Gi0/2, Gi0/3, Gi0/4, Gi0/5, Gi0/6, Gi0/7, Gi0/10, Gi0/12, Gi0/14, Gi0/15, Gi0/16 18 VLAN0018 active Gi0/11 120 FW_Vlan active 122 FW_mgmt active Gi0/9, Gi0/13 200 Management active 999 LAN_dummy active 1002 fddi-default act/unsup 1003 token-ring-default act/unsup 1004 fddinet-default act/unsup 1005 trnet-default act/unsup
upvoted 3 times
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depazs
5 years, 6 months ago
you rigth, aswer is C
upvoted 3 times
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depazs
5 years, 6 months ago
yes, C is the answer..
upvoted 3 times
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