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NEW QUESTION # 17
Examine the graphic.
router1#
Which action can be run directly from the Cisco router ' s IOS mode shown?
Answer: D
Explanation:
The Cisco IOS command prompt router1# indicates that the router is operating in Privileged EXEC mode.
Privileged EXEC mode provides access to advanced monitoring, diagnostic, and administrative commands. It allows administrators to examine system status, running configurations, interface statistics, routing information, and software details.
Commands available directly from this mode include:
* show running-config - Displays the active configuration.
* show version - Displays IOS software and hardware information.
* show interfaces - Displays interface operational status and statistics.
* show ip route - Displays the IPv4 routing table.
Why the other options are incorrect:
B). Select an interface to configure: Requires Global Configuration mode, accessed using configure terminal, followed by an interface command.
C). Enable a routing process: Requires Global Configuration mode, where routing commands such as router ospf 1 can be entered.
D). Enter interface IP configuration subcommands: Requires Interface Configuration mode, identified by the prompt router1(config-if)#.
The Cisco IOS CLI uses distinct command modes to separate operational monitoring from configuration activities.
Therefore, Option A is correct because Privileged EXEC mode supports direct execution of system information and diagnostic commands.
References:
Cisco Certified Support Technician Networking (100-150) - Cisco IOS Command-Line Interface and Device Management.
Cisco IOS Configuration Fundamentals Configuration Guide - Using the Cisco IOS Command-Line Interface.
Cisco IOS Configuration Fundamentals Command Reference - show running-config and Privileged EXEC Commands.
NEW QUESTION # 18
A help desk technician receives a report that a user is experiencing network connectivity issues. The help desk supervisor advises the technician to use a bottom-up troubleshooting method to determine the cause of the problem.
Which two potential issues would the technician check first using the bottom-up method? (Choose two.)
Answer: C,E
Explanation:
Correct Answers: C. Network interface card failure and D. Incorrect or damaged cables.
The bottom-up troubleshooting methodology follows the Open Systems Interconnection (OSI) reference model, beginning at Layer 1 (Physical Layer) and progressively moving toward higher layers.
The primary objective is to identify physical connectivity problems before investigating network configuration, transport protocols, or application services.
C). Network interface card failure - Correct
A faulty Network Interface Card (NIC) can prevent a computer from establishing a physical network connection. Technicians should examine NIC status indicators, verify link detection, inspect physical connections, and test the adapter using appropriate diagnostic tools.
D). Incorrect or damaged cables - Correct
Damaged Ethernet cables, defective connectors, improper cable termination, or disconnected cables can prevent reliable signal transmission. Technicians should inspect cable connections, examine link indicators, and replace questionable cables with known-good alternatives.
Why the other options are incorrect:
A). An incorrect network password involves authentication, which is investigated after physical connectivity.
B). An incorrect IP address configuration relates to Layer 3 networking.
E). An incorrect DNS server address affects name resolution, which is investigated at higher layers.
Therefore, C and D are the correct answers because both concern fundamental physical-layer connectivity.
Cisco Press explicitly identifies the Physical layer as the starting point for bottom-up troubleshooting.
Cisco Press+1
References:
Cisco Certified Support Technician Networking (100-150) - Network Troubleshooting, Physical Connectivity and Troubleshooting Methodologies.
Cisco Press, Troubleshooting Methods for Cisco IP Networks - Structured Troubleshooting Approaches:
The Bottom-Up Troubleshooting Approach.
Cisco Networking Academy, IT Essentials - Common Problems and Solutions for Networking.
NEW QUESTION # 19
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.
Answer:
Explanation:
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 addresses 1 . 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
NEW QUESTION # 20
In the network shown in the following graphic, Switch1 is a Layer 2 switch.
PC-A sends a frame to PC-C. Switch1 does not have a mapping entry for the MAC address of PC-C. Which action does Switch1 take?
Answer: D
Explanation:
For an unknown unicast destination, a Layer 2 switch floods the frame out all active ports except the one it was received on, ensuring delivery if the MAC is learned elsewhere.
NEW QUESTION # 21
A local company requires two networks in two new buildings. The addresses used in these networks must be in the private network range.
Which two address ranges should the company use? (Choose two.)
Note: You will receive partial credit for each correct selection.
Answer: A,B
Explanation:
192.168.0.0-192.168.255.255 is the 192.168.0.0/16 private address block.
172.16.0.0-172.31.255.255 is the 172.16.0.0/12 private address block.
NEW QUESTION # 22
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