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Objective 2.2

200-301

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.

2-2Network Access

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 switchportName: Gi1/0/1Switchport: EnabledAdministrative Mode: dynamic autoOperational Mode: static accessAdministrative Trunking Encapsulation: dot1qNegotiation of Trunking: OnAccess Mode VLAN: 1 (default) SW2# show interfaces gigabitethernet1/0/1 switchportName: Gi1/0/1Switchport: EnabledAdministrative Mode: dynamic autoOperational Mode: static accessAdministrative Trunking Encapsulation: dot1qNegotiation of Trunking: OnAccess Mode VLAN: 1 (default)

Why is the link not trunking?

Both ends are dynamic auto and neither opens negotiationCorrect · your answerCorrect. A passive setting on both sides leaves nobody to start the conversion.
The encapsulation has to be set to ISL on one sideISL is not supported on this platform, and the encapsulation field already agrees on both sides.
DTP is switched off despite Negotiation of Trunking OnNegotiation of Trunking: On is DTP reporting itself as running. The switchport nonegotiate command is what turns it off, and it is absent here.
The access VLAN must match before a trunk will come upAccess VLAN agreement matters for untagged forwarding on an access link. It is not a condition of trunk formation.

Correct.

Checked against cisco.com, August 2026

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 A

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.

Source

…switchport mode dynamic auto Makes the interface able to convert the link to a trunk link. The interface becomes a trunk interface if the neighboring interface is set to trunk or desirable mode. The default switchport mode for all Ethernet interfaces is dynamic auto.

Cisco: Configuring VLAN Trunks (Catalyst 9300, IOS XE 17.3.x), checked August 2026
#trunk#dtp#switchport-mode

Now you: objective 2.2 questions

No account needed. The explanation opens when you answer.

Sample question 1 of 3

2-2Network Access

An 802.1Q trunk is up between two switches and the console logs a warning.

SW1# show interfaces trunk Port        Mode      Encapsulation  Status        Native vlanGi1/0/24    on        802.1q         trunking      1 SW2# show interfaces trunk Port        Mode      Encapsulation  Status        Native vlanGi1/0/24    on        802.1q         trunking      99 %CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered onGigabitEthernet1/0/24 (99), with SW1 GigabitEthernet1/0/24 (1).

What risk does leaving this create?

Sample question 2 of 3

2-2Network Access

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 vlanGi1/0/48    on        802.1q         trunking      1 Port        Vlans allowed on trunkGi1/0/48    1,10,20 Port        Vlans allowed and active in management domainGi1/0/48    1,10,20 Port        Vlans in spanning tree forwarding state and not prunedGi1/0/48    1,10,20

What is stopping VLAN 30?

Sample question 3 of 3

2-2Network Access

Two switches exchange frames for several VLANs over one link. Which standard defines the tag that identifies each VLAN?

That’s 3 of the full CCNA bank.

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Read 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.

More objectives in Network Access