2.2 Configure and verify interswitch connectivity.
Objective 2.2 sits in Network Access, which carries 20% of the CCNA exam. The questions below are original, written from the official objective title above, and each explanation cites the Cisco page it rests on.
Objective title verbatim from the official objectives. Cisco exam page ↗
A worked example
Shown solved, with the whole explanation open: this is what every question here carries.
Two switches are cabled together and only VLAN 1 crosses the link. Neither side was given an explicit switchport mode.
SW1# show interfaces gigabitethernet1/0/1 switchport
Name: Gi1/0/1
Switchport: Enabled
Administrative Mode: dynamic auto
Operational Mode: static access
Administrative Trunking Encapsulation: dot1q
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
SW2# show interfaces gigabitethernet1/0/1 switchport
Name: Gi1/0/1
Switchport: Enabled
Administrative Mode: dynamic auto
Operational Mode: static access
Administrative Trunking Encapsulation: dot1q
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)Why is the link not trunking?
The concept
Dynamic Trunking Protocol has an active half and a passive half. A passive port will convert a link that something else asks it to convert, but it never raises the request itself, so a pair of passive ports settles at the fallback the administrative mode implies.
Why this answer
Both interfaces report the same passive administrative setting and both fall back to static access, which is the operational mode a link takes when no side asks for conversion. Setting one end to trunk or desirable, or setting both to trunk, gives the link something to act on.
- AISL is not supported on this platform, and the encapsulation field already agrees on both sides.
- BNegotiation of Trunking: On is DTP reporting itself as running. The switchport nonegotiate command is what turns it off, and it is absent here.
- Correct. A passive setting on both sides leaves nobody to start the conversion.
- DAccess VLAN agreement matters for untagged forwarding on an access link. It is not a condition of trunk formation.
Now you: objective 2.2 questions
No account needed. The explanation opens when you answer.
Sample question 1 of 2
An 802.1Q trunk is up between two switches and the console logs a warning.
SW1# show interfaces trunk
Port Mode Encapsulation Status Native vlan
Gi1/0/24 on 802.1q trunking 1
SW2# show interfaces trunk
Port Mode Encapsulation Status Native vlan
Gi1/0/24 on 802.1q trunking 99
%CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on
GigabitEthernet1/0/24 (99), with SW1 GigabitEthernet1/0/24 (1).What risk does leaving this create?
Sample question 2 of 2
Hosts in VLAN 30 cannot reach the far switch while VLAN 10 hosts can. Both VLANs are active in the database on both switches.
SW1# show interfaces trunk
Port Mode Encapsulation Status Native vlan
Gi1/0/48 on 802.1q trunking 1
Port Vlans allowed on trunk
Gi1/0/48 1,10,20
Port Vlans allowed and active in management domain
Gi1/0/48 1,10,20
Port Vlans in spanning tree forwarding state and not pruned
Gi1/0/48 1,10,20What is stopping VLAN 30?
That’s 2 of the full CCNA bank.
Keep going free: 10 questions per certification in bank practice, with no account.
Continue practicingRead the sources
These are the official pages the questions above cite. Reading them is studying the objective from the primary source, which is what the explanations point you toward anyway.