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NEW QUESTION # 80
A network administrator can successfully ping the URL www.cisco.com, but cannot ping a corporate server located at a remote branch in another city.
You need to identify the specific router where packets are being dropped in the path to the remote branch.
Which utility should you use?
Answer: C
Explanation:
Traceroute is a network diagnostic utility used to identify the sequence of routers that packets traverse between a source device and a destination.
It is particularly useful for investigating routing failures, connectivity interruptions, and unreachable remote networks.
Traceroute operates by transmitting probe packets with progressively increasing IP Time-to-Live (TTL) values.
The first probe uses a TTL value of 1, causing the first router to return an ICMP Time Exceeded message.
Subsequent probes increase the TTL to discover additional routers along the network path.
By examining the responding routers and their associated round-trip times, administrators can identify where responses stop or connectivity becomes unreliable.
For example, on Cisco IOS:
traceroute 192.168.50.10
On Windows, the equivalent utility is:
tracert 192.168.50.10
Why the other options are incorrect:
A). netstat: Displays network connections, socket information, and protocol statistics.
B). telnet: Establishes a TCP connection to a remote service and can test TCP port accessibility.
C). ipconfig: Displays and manages local IP configuration information on Windows.
D). traceroute: Discovers intermediate network hops and helps isolate routing problems.
Important distinction: A nonresponding hop is not definitive proof of packet loss at that router, because ICMP responses may be filtered or rate-limited. Traceroute identifies potential failure points for further investigation.
References:
Cisco Certified Support Technician Networking (100-150) - Network Troubleshooting, Diagnostic Commands and Network Connectivity.
Cisco, Use the Traceroute Command on Operating Systems.
Cisco, Understand the Extended Ping and Extended Traceroute Commands.
NEW QUESTION # 81
What is the function of DNS in a network when users attempt to access websites using domain names instead of IP addresses?
Answer: B
Explanation:
DNS resolves human-readable domain names into IP addresses, allowing users to access websites without memorizing numerical addresses, making internet navigation more user-friendly.
NEW QUESTION # 82
For each statement about bandwidth and throughput, select True or False.
Note: You will receive partial credit for each correct selection.
Answer:
Explanation:
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.
References:
* Network Performance Metrics: Cisco Network Performance
* Understanding Bandwidth and Latency: Bandwidth vs. Latency
NEW QUESTION # 83
Which standard contains the specifications for Wi-Fi networks?
Answer: D
Explanation:
The IEEE 802.11 standard contains the specifications for Wi-Fi networks. It is a set of media access control (MAC) and physical layer (PHY) specifications for implementing wireless local area network (WLAN) computer communication in various frequencies, including but not limited to 2.4 GHz, 5 GHz, and 6 GHz1. This standard is maintained by the Institute of Electrical and Electronics Engineers (IEEE) and is commonly referred to as Wi-Fi. The standard has evolved over time to include several amendments that improve speed, range, and reliability of wireless networks.
Reference: =
* The Most Common Wi-Fi Standards and Types, Explained
* 802.11 Standards Explained: 802.11ax, 802.11ac, 802.11b/g/n, 802.11a
* Wi-Fi Standards Explained - GeeksforGeeks
NEW QUESTION # 84
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?
Answer: A
Explanation:
Ping the default gateway from the user ' s computer.
The divide-and-conquer troubleshooting methodology begins at an intermediate OSI layer, typically Layer 3 (Network), rather than systematically examining all seven layers from the top or bottom.
In this scenario, the user can access resources on the local area network but cannot reach websites on the internet.
This suggests that basic local connectivity is operational, although it does not establish whether the computer can communicate with its default gateway.
The most appropriate initial diagnostic action is to ping the default gateway.
A successful ping verifies IP-layer communication with the local router and provides evidence that the underlying LAN connectivity is functioning.
If the ping succeeds, troubleshooting can proceed toward upstream routing, DNS resolution, firewall policies, or internet connectivity.
If the ping fails, the technician should investigate the configured gateway address, VLAN membership, local routing, and Layer 2 connectivity.
Why the other options are incorrect:
A). Telnet tests TCP connectivity to a specific service and is not the preferred initial Layer 3 diagnostic test.
B). Checking the network adapter follows a lower-layer troubleshooting approach.
C). Inspecting cable connections begins at the Physical layer, which is characteristic of bottom-up troubleshooting.
Therefore, Option D correctly applies the divide-and-conquer methodology.
Cisco Press+1
References:
Cisco Certified Support Technician Networking (100-150) - Troubleshooting Methodologies and Diagnostic Tools.
Cisco Press - Troubleshooting Methods for Cisco IP Networks, Divide-and-Conquer Approach.
Cisco Troubleshooting TCP/IP - Checking Local Connectivity and Default Gateway Reachability.
NEW QUESTION # 85
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