Questions and Answers
What does UEFI stand for?
What is Secure Boot?
A feature that compares digital signatures to the operating system you are running.
Motherpower Power includes a _____ pin main power.
20/24
A Molex connector is which of the following?
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What is the function of the 8 pin EPS?
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What does PCIe stand for?
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What is the data width of DIMM?
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Northbridge connects the CPU to the memory and high-speed graphics card.
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What is the maximum length of USB 2?
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FireWire supports a maximum distance limit of _____ meters.
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What is the main feature of RAID 0?
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What is the capacity of a standard CD-ROM?
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Match the following types of RAM with their characteristics:
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Study Notes
UEFI and Secure Boot
- UEFI enables booting from GPT disks larger than 2.2TB and supports remote connections.
- Secure Boot compares the digital signatures of the operating system to ensure integrity.
Power Supply Connectors
- Motherboard power typically has a 20/24 pin connector; a 24 pin fits a 20 pin for PCIe power.
- Molex connectors provide 4-pin power options at either 12V or 5V.
- 4 pin ATX connectors supply 12V, while 8 pin EPS connectors provide 12V for multiple CPUs.
PCI and Expansion Slots
- PCI buses operate on 32 and 64-bit architectures, using parallel data transfer where all bits are sent simultaneously.
- PCI-X offers greater throughput and is tailored for server environments.
- PCIe utilizes serial communication for faster data transfer, available in configurations like x1 to x32 with full duplex capabilities.
Memory Types and Specifications
- DIMM (Dual In-Line Memory Module) has a 64-bit data width and contacts on both sides.
- Northbridge connects CPUs to high-speed graphics and memory, while Southbridge connects to peripheral interfaces like USB and Ethernet.
USB Standards
- USB 1.1 supports speeds of 1.5Mb/s and 12Mb/s, with a maximum length of 5m.
- USB 2 achieves 480Mb/s at the same maximum length.
- USB 3 can transfer data at 5 Gb/s, limited to 3m of cable.
FireWire Connections
- FireWire (IEEE 1394) chains up to 63 devices and has a max length of 4.5m.
- FireWire 400 supports speeds of 100, 200, and 400 Mb/s, while FireWire 800 reaches 800 Mb/s.
SATA Specifications
- SATA uses a 15 pin power and a 7 pin data connector; version 1 tops at 1.5Gb/s and version 3 at 6Gb/s, each with a maximum length of 1m.
Video Connectors
- VGA is an analog-only signal with a DB-15 connector and a 5-10m maximum length.
- HDMI features a 19 pin type A connector with a 20m limit before signal loss.
Networking Standards
- Bluetooth ranges from Class 1 (100m) to Class 3 (1m) and has versions with speeds from 1Mb/s to 24Mb/s.
- The 802.11 family of wireless standards varies by speed and frequency, from 802.11b at 2.4GHz/11Mb/s to 802.11ac at 5GHz/693Gb/s.
Storage Methods
- Raid configurations include RAID 0 for striping without redundancy, RAID 1 for mirroring, and RAID 5 for striping with parity.
- Optical media capacities include CD-ROM (700MB), DVD-ROM (4.7GB single layer, 8.5GB dual layer), and Blu-Ray (25GB single layer, 50GB dual layer).
Troubleshooting Techniques
- For lockups, check HDD lights and update drivers; low RAM may also cause issues.
- Boot into last known good configuration to fix bad driver configurations.
- Common printer troubleshooting includes checking drum for scratches, cleaning print heads for inkjets, and ensuring proper drivers are used.
Types of Memory
- PROM can be written once, while EPROM is erasable.
- ECC memory includes error correction, while parity memory adds an extra bit but cannot correct errors.
- Registered/Buffered memory includes a register for stability.
Fiber Optic Information
- Multimode fiber can reach up to 2Km using an inexpensive LED source, while single-mode fiber can extend up to 100Km using a laser source.
Networking Protocols
- APIPA (Automatic Private Internet Protocol Addressing) allocates IPs between 169.254.1.0 to 169.254.254.255.
- Lightweight Directory Access Protocol (LDAP) operates over TCP/UDP on port 389.
Security Protocols
- WEP offers basic security but is vulnerable, while WPA and WPA2 use TKIP and AES encryption respectively for improved security.
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Description
Test your knowledge with these flashcards designed for the CompTIA A+ 901 certification. Each card covers important terms and definitions essential for understanding computer hardware and firmware. Prepare effectively for your exam by mastering key concepts.
