Main Frequency Calculation - Architecture Question (23)

1. A file system adopts a multi-level index structure. If the size of the magnetic block is 4K bytes, and each block number needs to occupy 4 bytes, then the maximum length of the file when the two-level index structure is used can occupy () physical blocks.

1、1024

2、1024*1024

3、2048*2048

4、4096*4096

Answer: B

Parse:

disk size/block size

4/4=1024kb*1024kb

1. At present, there are two types of processors in the processor market, CPU and DSP, which are used in different scenarios. These two processors have different architectures, and DSP uses ( ).

1. von Neumann structure
2. harvard structure
3. FPGA structure
4. Same structure as GPU

Answer: B

Parse:

Harvard Structure: Data programs are separated.

Von Neumann structure: data program together.

GPU: Von upgraded version.

1. For the serial bus, the correct one is ().

1. Serial buses are generally duplex buses, suitable for long-distance data transmission.
2. The baud rate of serial bus transmission is pre-defined when the bus is initialized and cannot be changed during use.
3. When the serial bus transmits data bit by bit, the correctness of the data depends on the check code correction
4. The data transmission and reception of the serial bus work in the way of software inquiry.

Answer: B

Parse:

There are half-full and double-full power of the serial bus.

Suitable for transmitting data over long distances.

There are many ways to transmit and receive data on the serial bus, interrupt mode and DMA are more common.

1. The frequency of the CPU includes main frequency, multiplier and FSB. The FSB of a processor is 200MHz, the multiplier is 13, and the main frequency of this processor is ().

Answer: 2.6GHz

Parse:

Main frequency = FSB * multiplier

200MHz*13 = 2600MHz

2.6GHz

1. If the information code word is 111000110 and the generator polynomial G(x)=X^5+x^3+x+1, the calculated CRC check code is ().

A、01101

B、11001

C、001101

D、011001

Answer: B

Parse:

1*5+0*4+1*3+0*2+1x+11

1. When nslookup is run on the client computer to query the name of a certain server, the IP address can be resolved, but the server name cannot be resolved when the IP address is queried. The solution to this problem is ().

1. Clear DNS cache
2. flush DNS cache
3. Create a PTR record for this server
4. Restart the DNS service

Answer: C

Parse:

DNS is responsible for both forward resolution and reverse resolution, so the DNS service is normal.

1. If the address of the sending DHCP client has been used by other DHCP clients, the client will send a () packet to the server to refuse to receive the assigned address information.

1. DHCPACK
2. DHCPOFFER
3. DHCPDECLINE
4. DHCPNACK

Answer: C

Parse:

DHCPDecline: After receiving the ACK message from the DHCP server, the DHCP client finds that the address allocated by the server conflicts or cannot be used due to other reasons through address conflict detection, and then sends a Decline message to notify the server that the allocated IP address is unavailable.

1. In order to optimize the database system, it mainly includes CPU/memory usage status, (), process/thread usage status, log file size, etc.

1. Data packet loss rate
2. port throughput
3. data processing rate
4. query performance

Answer: D