8 Integrated CCNA Practice and Review Free Online FlashCards

What trunk checks can explain VLAN 10 failing between switches?

The trunk’s allowed-VLAN list must include VLAN 10, and the trunk must be operational. Check `show interfaces trunk`.

How does router-on-a-stick route between VLANs?

Router-on-a-stick uses a router subinterface for each VLAN, with 802.1Q encapsulation and an IP address for that VLAN’s subnet.

Where should a DHCP relay address be configured?

Configure `ip helper-address` on the Layer 3 interface that receives the client broadcast, such as the VLAN 20 router subinterface.

Which route matches destination 10.8.4.25: 10.8.0.0/16 or 10.8.4.0/24?

The router selects `10.8.4.0/24` because longest-prefix matching chooses the most specific matching route.

What should you check when directly connected routers lack an OSPF neighbor relationship?

Check link and IP reachability, OSPF on the correct interfaces, matching area and compatible interface parameters, and unique, stable router IDs.

Will a DNS permit work if a broader matching deny comes first in an ACL?

No. ACLs use the first matching entry, so the earlier deny blocks the traffic before the DNS permit is reached. Put the specific permit first.

What happens to traffic that matches no listed ACL entry?

An ACL has an implicit deny after its listed entries, so traffic not matched by an earlier permit is denied.

What configuration elements are essential for PAT translation?

PAT translates eligible inside addresses to the outside interface address. The inside and outside interfaces must be identified, and the NAT ACL must match the source addresses.

What does DHCP snooping help prevent, and which ports should be trusted?

DHCP snooping helps stop unauthorized DHCP servers from answering clients. Generally, trust only ports leading to legitimate DHCP servers or trusted infrastructure.

Why prefer SSH over Telnet for remote CLI access?

SSH encrypts remote management traffic; Telnet does not protect credentials or session contents in transit.

What do authentication, authorization, and accounting each do?

Authentication verifies identity; authorization determines permitted actions; accounting records activity.

In a REST API workflow, what does GET do, and what is JSON?

GET commonly retrieves a resource. JSON is a structured data-encoding format that can represent the response; it is not an HTTP method.