200-301Updated 1d ago · Sep 4, 2026
Cisco Certified Network Associate (CCNA)
1,334 questions across 1 topics, with suggested answers, explanations where available, and imported community discussion. The first 133 questions are free to preview.
Topics
| # | Topic | Questions | Free |
|---|---|---|---|
| 1 | Network Fundamentals | 1334 | 133 |
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133 of 1334 accessibleQuestion 1 · Network Fundamentals Open
What are two characteristics that distinguish optical-fiber cabling from copper cabling? **(Choose two.)**
Answer: C, E
Optical-fiber cabling supports higher bandwidth and data-rate options than copper cabling, and it can transmit signals over much longer distances because it uses light rather than electrical signaling. Copper cabling is limited by greater attenuation and electromagnetic interference and is also the medium used for PoE, whereas fiber is not.
**Learn more:** [Cisco SFP Modules for Gigabit Ethernet Data Sheet](https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/gigabit-ethernet-gbic-sfp-modules/datasheet-c78-366584.html) · [Optical Fiber Explained and Demystified](https://learningnetwork.cisco.com/s/blogs/a0D3i000002SKR6EAO/optical-fiber-explained-and-demystified)
Question 2 · Network Fundamentals Open
Refer to the exhibit. Which switch will become the root bridge?
Answer: B
The root bridge in Spanning Tree Protocol is elected using the lowest Bridge ID. Bridge ID comparison uses the lowest bridge priority first, and if there is a tie, the lowest MAC address wins. The lowest listed priority is 8192, shared by SW4 and SW2. Between those two, SW2 has the lower MAC address (`00:ac:f0:9b:dc:72`), so it has the lowest Bridge ID and is elected the root bridge.
**Learn more:** [Configuring Spanning Tree Protocol](https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9300/software/release/16-10/configuration_guide/lyr2/b_1610_lyr2_9300_cg/configuring_spanning___tree_protocol.html)
Question 3 · IP Services Open
Refer to the exhibit. A network associate configured OSPF with the command: `City(config-router)# network 192.168.12.64 0.0.0.63 area 0` After finishing the configuration, the associate finds that not all interfaces are participating in OSPF. Based on this configuration statement, which three interfaces shown in the exhibit will participate in OSPF? **(Choose three.)**
Answer: B, C, D
In Cisco OSPF, the `network` command enables OSPF on interfaces whose IP addresses fall within the address range defined by the network address and wildcard mask. The wildcard `0.0.0.63` matches a /26 block, so `network 192.168.12.64 0.0.0.63 area 0` covers addresses from `192.168.12.64` to `192.168.12.127`. The interfaces in that range are `192.168.12.65`, `192.168.12.121`, and `192.168.12.125`, which correspond to FastEthernet0/1, Serial0/0, and Serial0/1.102.
**Learn more:** [Implementing OSPFv2 Using network Commands](https://www.ciscopress.com/articles/article.asp?p=3197438&seqNum=3) · [Configuring OSPF](https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9500/software/release/16-10/configuration_guide/rtng/b_1610_rtng_9500_cg/configuring_ospf.html)