9 Integrated Network Infrastructure Labs Free Online FlashCards

What does a VLAN separate?

A VLAN separates Layer 2 broadcast domains. Communication between VLANs requires a Layer 3 device.

What is a trunk link used for?

A trunk carries the required VLANs between devices. Limit its allowed VLAN list to those the link needs.

What enables communication between VLANs?

Inter-VLAN communication requires a Layer 3 device, such as a router or Layer 3 switch.

How should a switch port for an endpoint be configured?

Configure endpoint ports as access ports in the VLAN intended for those devices.

When does an AP generally need a trunk link?

An AP mapping multiple SSIDs to VLANs generally needs a trunk; a single-network AP may use an access port.

What does a basic cable wire-map pass not prove?

A basic wire-map pass checks wiring continuity and mapping, but does not certify cable category or performance.

Where should DHCP relay be configured when the server is outside a client VLAN?

If the DHCP server is outside a client VLAN, configure and verify DHCP relay on that VLAN's gateway.

Why don't VLANs alone secure guest traffic?

Creating VLANs alone does not provide security. Apply access controls to restrict traffic, such as denying guest access to staff and management networks.

How should staff and guest SSIDs connect to network segments?

Map each SSID to its corresponding VLAN, then verify the wireless client receives that VLAN's IP settings.

What order should be used to troubleshoot network faults?

Troubleshoot in order: physical link, switching and VLAN, IP configuration, routing and policy, wireless association and radio conditions, then application.

What should you check when a client receives no DHCP address?

Check the client's access VLAN, trunk VLAN allowance, DHCP scope, relay, server reachability, and whether the address pool is exhausted.

A client can ping its gateway but not another subnet. What should you investigate?

Gateway reachability works, so investigate routing, subnet mask, return route, and access-control rules for the remote subnet.