In the TCP/IP model, the Transport layer provides end-to-end communication services like segmentation and reassembly of data.
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Transport
The Transport layer ensures reliable data delivery between applications on different hosts, managing flow control and error recovery.
Question 2
Classless Inter-Domain Routing, or CIDR, allows for more efficient allocation of IP addresses by using variable-length subnet masks.
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CIDR
CIDR notation specifies the network prefix length, enabling more flexible and efficient IP address allocation compared to classful addressing.
Question 3
A router connects different networks and forwards data packets between them based on IP addresses.
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router
Routers operate at the Network layer, making decisions about the best path to send data across interconnected networks.
Question 4
A network switch operates at the Data Link layer and forwards frames to specific devices within the same local area network based on MAC addresses.
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switch
Switches learn MAC addresses of connected devices and use them to direct network traffic efficiently within a LAN, reducing unnecessary broadcasts.
Question 5
The Domain Name System, or DNS, translates human-readable domain names into numerical IP addresses.
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DNS
DNS is a hierarchical and decentralized naming system that resolves domain names to IP addresses, making it easier for users to access websites and services.
Question 6
Dynamic Host Configuration Protocol, or DHCP, automatically assigns IP addresses and other network configuration parameters to devices on a network.
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DHCP
DHCP simplifies network administration by centralizing the management and allocation of IP addresses and other network settings to client devices.
Question 7
Web browsers typically use port 80 for unencrypted HTTP communication.
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80
Port 80 is the standard well-known port for the Hypertext Transfer Protocol (HTTP), used for serving web pages.
Question 8
Secure web traffic, utilizing HTTPS, encrypts data over port 443.
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443
Port 443 is the standard well-known port for HTTPS, which provides secure communication over a computer network.
Question 9
Remote secure shell access to a server is commonly established over port 22.
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22
Port 22 is the standard well-known port for the Secure Shell (SSH) protocol, used for secure remote command-line access and file transfer.
Question 10
File Transfer Protocol, or FTP, often uses port 21 for control connections.
Missing Word
21
Port 21 is the default control port for FTP, which is used to transfer files between a client and a server.
Question 11
To test basic network connectivity between two hosts, a network administrator would typically use the ping utility.
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ping
The ping utility sends ICMP echo request packets to a target host and measures the response time, indicating basic reachability.
Question 12
When diagnosing network path issues and identifying intermediate hops, the traceroute command is invaluable.
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traceroute
Traceroute maps the path a packet takes to reach its destination, showing each router (hop) along the way and the time taken for each hop.
Question 13
User-facing protocols like HTTP, FTP, and SMTP reside in the Application layer of the OSI model.
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Application
The Application layer provides network services directly to end-user applications, enabling them to communicate over the network.
Question 14
As data moves down the OSI model layers, each layer adds its own header information in a process known as encapsulation.
Missing Word
encapsulation
Encapsulation is the process where each layer in the OSI or TCP/IP model adds protocol-specific control information to the data unit received from the layer above.