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NEW QUESTION # 234
A network engineer configures a new switch and connects it to an existing switch for expansion and redundancy. Users immediately lose connectivity to the network. The network engineer notes the following spanning tree information from both switches:
Switch 1
Port State Cost
1 Forward 2
2 Forward 2
Switch 2
Port State Cost
1 Forward 2
2 Forward 2
Which of the following best describes the issue?
Answer: C
Explanation:
Explanation: The issue is that no root bridge has been identified. In STP, a root bridge is necessary to manage redundant paths and avoid loops in the network. Without a root bridge, all switches will assume they can forward traffic, causing a network loop and connectivity problems.
NEW QUESTION # 235
A network administrator needs to divide 192.168.1.0/24 into two equal halves. Which of the following subnet masks should the administrator use?
Answer: B
Explanation:
Understanding Subnetting:
Original Network: 192.168.1.0/24 has a subnet mask of 255.255.255.0, which allows for 256 IP addresses (including network and broadcast addresses).
Objective: Divide this network into two equal subnets.
Calculating Subnet Mask:
New Subnet Mask: To divide 192.168.1.0/24 into two equal halves, we need to borrow one bit from the host portion of the address, changing the subnet mask to 255.255.255.128 (/25).
Subnet Breakdown:
First Subnet: 192.168.1.0/25 (192.168.1.0 - 192.168.1.127)
Second Subnet: 192.168.1.128/25 (192.168.1.128 - 192.168.1.255)
Verification:
Each subnet now has 128 IP addresses (126 usable IP addresses, excluding the network and broadcast addresses).
Comparison with Other Options:
255.255.0.0 (/16): Provides a much larger network, not dividing the original /24 network.
255.255.254.0 (/23): Also creates a larger subnet, encompassing more than the original /24 network.
255.255.255.0 (/24): Maintains the original subnet size, not dividing it.
Reference:
CompTIA Network+ study materials on subnetting and IP addressing.
NEW QUESTION # 236
Users cannot connect to an internal website with an IP address 10.249.3.76. A network administrator runs a command and receives the following output:
1 3ms 2ms 3ms 192.168.25.234
2 2ms 3ms 1ms 192.168.3.100
3 4ms 5ms 2ms 10.249.3.1
4 *
5 '
6 *
7 *
Which of the following command-line tools is the network administrator using?
Answer: D
Explanation:
Understanding Tracert:
tracert (Traceroute in Windows) is a command-line tool used to trace the path that packets take from the source to the destination. It records the route (the specific gateways at each hop) and measures transit delays of packets across an IP network.
Output Analysis:
The output shows a series of IP addresses with corresponding round-trip times (RTTs) in milliseconds.
The asterisks (*) indicate that no response was received from those hops, which is typical for routers or firewalls that block ICMP packets used by tracert.
Comparison with Other Tools:
netstat: Displays network connections, routing tables, interface statistics, and more, but does not trace packet routes.
tcpdump: Captures network packets for analysis, used for detailed network traffic inspection.
nmap: A network scanning tool used to discover hosts and services on a network, not for tracing packet routes.
Usage:
tracert helps identify the path to a destination and locate points of failure or congestion in the network.
Reference:
CompTIA Network+ study materials on network troubleshooting and diagnostic tools.
NEW QUESTION # 237
Which of the following steps in the troubleshooting methodology comes after using a top-to-top buttom examination of the OSI model to determine cause?
Answer: D
NEW QUESTION # 238
Which of the following connectors provides console access to a switch?
Answer: A
Explanation:
* Console Access:
* Purpose:Console access to a switch allows administrators to configure and manage the device directly. This is typically done using a terminal emulator program on a computer.
* RJ45 Connector:
* Common Use:The RJ45 connector is widely used for Ethernet cables and also for console connections to network devices like switches and routers.
* Console Cables:Console cables often have an RJ45 connector on one end (for the switch) and a DB9 serial connector on the other end (for the computer).
* Comparison with Other Connectors:
* ST (Straight Tip):A fiber optic connector used for networking, not for console access.
* BNC (Bayonet Neill-Concelman):A connector used for coaxial cable, typically in older network setups and not for console access.
* SFP (Small Form-factor Pluggable):A modular transceiver used for network interfaces, not for console access.
* Practical Application:
* Connection Process:Connect the RJ45 end of the console cable to the console port of the switch.
Connect the DB9 end (or USB via adapter) to the computer. Use a terminal emulator (e.g., PuTTY, Tera Term) to access the switch's command-line interface (CLI).
References:
* CompTIA Network+ study materials on network devices and connectors.
NEW QUESTION # 239
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