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Difficulty: MediumLayer 2 Discovery Protocols (CDP and LLDP)

A network administrator executes the following command on switch SW-Core1 to verify direct physical connections:

SW-Core1# show cdp neighbors
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone

Device ID Local Intrfce Holdtme Capability Platform Port ID
SW-Access2 Gig 1/0/1 158 S I WS-C3850 Gig 1/0/24

Based on this output, which local physical interface on SW-Core1 is connected to the neighboring switch?

  1. GigabitEthernet 1/0/1Answer
  2. B
    GigabitEthernet 1/0/24
  3. C
    WS-C3850
  4. D
    VLAN 1

Answer

GigabitEthernet 1/0/1 is the local physical interface on SW-Core1 connected to the neighboring device.
The 'show cdp neighbors' command displays summary information about directly connected Cisco devices. The 'Local Intrfce' field specifies the local interface on the current device (SW-Core1) where the CDP frames are received, which is GigabitEthernet 1/0/1. The 'Port ID' field indicates the port on the neighboring device (GigabitEthernet 1/0/24).

Step-by-Step Solution

1
Examine the output headers of the 'show cdp neighbors' command
Identify that 'Local Intrfce' corresponds to the local device interface, while 'Port ID' corresponds to the remote neighbor interface.
CDP separates local interface information from peer interface information across distinct table columns.
2
Locate the entry under the 'Local Intrfce' column for SW-Access2
The column value displays 'Gig 1/0/1'.
This confirms that SW-Core1 receives CDP advertisements from SW-Access2 on its local interface GigabitEthernet 1/0/1.

Key Concept

CDP Neighbor Table Data Fields Interpretation
Estimated Time:1m 0s
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Topics

Layer 2 Discovery Protocols (CDP and LLDP)

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