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問題 #40
Which command will display all the current operational settings configured on a Cisco router?
答案：A
解題說明：
The show running-config command is used on a Cisco router to display the current operational settings that are actively configured in the router's RAM. This command outputs all the configurations that are currently being executed by the router, which includes interface configurations, routing protocols, access lists, and other settings. Unlike show startup-config, which shows the saved configuration that the router will use on the next reboot, show running-config reflects the live, current configuration in use.
Reference: = The information is supported by multiple sources that detail the use of Cisco commands, particularly the show running-config command as the standard for viewing the active configuration on a Cisco device123.
show running-config: This command displays the current configuration running on the router. It includes all the operational settings and configurations applied to the router.
show protocols: This command shows the status of configured protocols on the router but not the entire configuration.
show startup-config: This command displays the configuration saved in NVRAM, which is used to initialize the router on startup, but not necessarily the current running configuration.
show version: This command provides information about the router's software version, hardware components, and uptime but does not display the running configuration.
Reference: Cisco IOS Commands: Cisco IOS Commands
問題 #41
You want to list the IPv4 addresses associated with the host name www.companypro.net.
Complete the command by selecting the correct option from each drop-down list.
答案：
解題說明：
Explanation:
To list the IPv4 addresses associated with the host name www.companypro.net, you should use the following command:
nslookup www.companypro.net
This command will query the DNS servers to find the IP address associated with the hostname provided. If you want to ensure that it returns the IPv4 address, you can specify the -type=A option, which stands for Address records that hold IPv4 addresses1. However, the nslookup command by default should return the IPv4 address if available.
To list the IPv4 addresses associated with the host name www.companypro.net, you should use the nslookup command.
* Command: nslookup
* Target: www.companypro.net
So, the completed command is:
* nslookup www.companypro.net
* nslookup: This command is used to query the Domain Name System (DNS) to obtain domain name or IP address mapping or for any other specific DNS record.
* www.companypro.net: This is the domain name you want to query to obtain its associated IP addresses.
References:
* Using nslookup: nslookup Command Guide
問題 #42
HOTSPOT
For each statement about bandwidth and throughput, select True or False. Note: You will receive partial credit for each correct selection.
答案：
解題說明：
Explanation:
Statement 1: Low bandwidth can increase network latency.
True: Low bandwidth can result in increased network latency because the network may become congested, leading to delays in data transmission.
Statement 2: High levels of network latency decrease network bandwidth.
False: High levels of network latency do not decrease the available network bandwidth, but they do affect the perceived performance and throughput of the network.
Statement 3: You can increase throughput by decreasing network latency.
True: Decreasing network latency can increase throughput because data can be transmitted more quickly and efficiently without delays.
Bandwidth vs. Latency: Bandwidth refers to the maximum rate at which data can be transferred over a network path. Latency is the time it takes for a data packet to travel from the source to the destination.
Low bandwidth can cause network congestion, which can increase latency as packets wait to be transmitted.
High latency does not reduce the actual bandwidth but can affect the overall performance and efficiency of data transmission.
Reducing latency can lead to higher throughput because the network can handle more data in a given period without delays.
Reference: Network Performance Metrics: Cisco Network Performance
Understanding Bandwidth and Latency: Bandwidth vs. Latency
問題 #43
What is the most compressed valid format of the IPv6 address 2001 :0db8:0000:0016:0000:001b: 2000:0056?
答案：A
解題說明：
IPv6 addresses can be compressed by removing leading zeros and replacing consecutive groups of zeros with a double colon (::). Here's how to compress the address 2001:0db8:0000:0016:0000:001b:2000:0056:
Remove leading zeros from each segment:
2001:db8:0000:0016:0000:001b:2000:0056 becomes 2001:db8:0:16:0:1b:2000:56
Replace the longest sequence of consecutive zeros with a double colon (::). In this case, the two consecutive zeros between the 16 and 1b:
2001:db8:0:16::1b:2000:56
Thus, the most compressed valid format of the IPv6 address is 2001:db8:0:16::1b:2000:56.
Reference: =
Cisco Learning Network
IPv6 Addressing (Cisco)
問題 #44
A user at your company cannot connect to websites on the internet. However, they can connect to network resources on the company LAN.
You want to use the divide-and-conquer approach to troubleshoot the issue.
What should you do first?
答案：C
解題說明：
The divide-and-conquer method starts testing in the middle of the stack to quickly narrow the problem. Pinging the default gateway checks whether the user can reach beyond the local host to the local network boundary. Since the user can access LAN resources but not internet websites, this is the best first step to determine whether the issue is on the local side or farther upstream.
問題 #45
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