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NEW QUESTION # 76
During the data encapsulation process, which OSI layer adds a header that contains MAC addressing information and a trailer used for error checking?
Answer: B
Explanation:
OSI model
During the data encapsulation process, the Data Link layer of the OSI model is responsible for adding a header that contains MAC addressing information and a trailer used for error checking. The header typically includes the source and destination MAC addresses, while the trailer contains a Frame Check Sequence (FCS) which is used for error detection1.
The Data Link layer ensures that messages are delivered to the proper device on a LAN using hardware addresses and translates messages from the Network layer into bits for the Physical layer to transmit. It also controls how data is placed onto the medium and is received from the medium through the physical hardware.
References :=
* The OSI Model - The 7 Layers of Networking Explained in Plain English
* OSI Model - Network Direction
* Which layer adds both header and trailer to the data?
* What is OSI Model | 7 Layers Explained - GeeksforGeeks
NEW QUESTION # 77
Which two statements are true about the IPv4 address of the default gateway configured on a host? (Choose two.) Note: You will receive partial credit for each correct selection.
Answer: B,D
Explanation:
The default gateway must be an IP address assigned to the router's interface on the same subnet as the host.
All hosts on a given local network use the same gateway IP to reach external networks.
NEW QUESTION # 78
Which command will display the following output?
Answer: C
Explanation:
The command that will display the output provided, which includes capability codes, local interface details, device IDs, hold times, and platform port ID capabilities, is the show cdp neighbor command. This command is used in Cisco devices to display current information about neighboring devices detected by Cisco Discovery Protocol (CDP), which includes details such as the interface through which the neighbor is connected, the type of device, and the port ID of the device1.
References :=
*Cisco - show cdp neighbors
The provided output is from the Cisco Discovery Protocol (CDP) neighbor table. The show cdp neighbor command displays information about directly connected Cisco devices, including Device ID, Local Interface, Holdtime, Capability, Platform, and Port ID.
*A. show mac-address-table: Displays the MAC address table on the switch.
*C. show inventory: Displays information about the hardware inventory of the device.
*D. show ip interface: Displays IP interface status and configuration.
Thus, the correct answer is B. show cdp neighbor.
References :=
*Cisco CDP Neighbor Command
*Understanding CDP
NEW QUESTION # 79
A user reports that a company website is not available. The help desk technician issues a tracert command to determine if the server hosting the website is reachable over the network.
The output of the command is shown as follows:
What can you tell from the command output?
Answer: B
Explanation:
The tracert command output shows the path taken to reach the destination IP address, 192.168.1.10.
The command output indicates:
* Hops 1 and 2 are successfully reached.
* Hop 3 times out, meaning the router at hop 3 did not respond to the tracert request.
However, this does not necessarily indicate a problem with forwarding packets, as some routers may be configured to block or not respond to ICMP requests.
* Hops 4 and 5 are successfully reached, with hop 5 being the destination IP 192.168.1.10, indicating that the server is reachable.
Thus, the correct answer is C. The server with the address 192.168.1.10 is reachable over the network.
Reference: =
* Cisco Traceroute Command
* Understanding Traceroute
The tracert command output indicates that the server with the address 192.168.1.10 is reachable over the network. The asterisk (*) at hop 3 suggests that the probe sent to that hop did not return a response, which could be due to a variety of reasons such as a firewall blocking ICMP packets or the router at that hop being configured not to respond to ICMP requests. However, since the subsequent hops (4 and 5) are showing response times, it means that the packets are indeed getting through and the server is reachable12.
Reference: =
* How to Use Traceroute Command to Read Its Results
* How to Use the Tracert Command in Windows
NEW QUESTION # 80
A host is given the IP address 172.16.100.25 and the subnet mask 255.255.252.0.
What is the CIDR notation for this address?
Answer: A
Explanation:
The mask 255.255.252.0 has 22 contiguous one bits (16 from the first two octets plus 6 from the third), which corresponds to a /22 prefix.
NEW QUESTION # 81
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