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Cisco Certified Support Technician (CCST) Networking Sample Questions (Q38-Q43):
NEW QUESTION # 38
Which information is included in the header of a UDP segment?
Answer: D
Explanation:
The header of a UDP (User Datagram Protocol) segment includes port numbers. Specifically, it contains the source port number and the destination port number, which are used to identify the sending and receiving applications. UDP headers do not include IP addresses or MAC addresses, as those are part of the IP and Ethernet frame headers, respectively. Additionally, UDP does not use sequence numbers, which are a feature of TCP (Transmission Control Protocol) for ensuring reliable delivery of data segments1.
Reference: =
Segmentation Explained with TCP and UDP Header
User Datagram Protocol (UDP) - GeeksforGeeks
Which three fields are used in a UDP segment header
UDP Header: The header of a UDP segment includes the following key fields:
Source Port: The port number of the sending application.
Destination Port: The port number of the receiving application.
Length: The length of the UDP header and data.
Checksum: Used for error-checking the header and data.
IP Addresses: These are included in the IP header, not the UDP header.
Sequence Numbers: These are part of the TCP header, not UDP.
MAC Addresses: These are part of the Ethernet frame header and are not included in the UDP header.
Reference: RFC 768 - User Datagram Protocol: RFC 768
Cisco Guide on UDP: Cisco UDP Guide
NEW QUESTION # 39
You plan to use a network firewall to protect computers at a small office.
For each statement about firewalls, select True or False.
Note: You will receive partial credit for each correct selection.
Answer:
Explanation:
Explanation:
* A firewall can direct all web traffic to a specific IP address.
* True: Firewalls can be configured to perform Network Address Translation (NAT) and port forwarding, which can direct all web traffic (typically on port 80 and 443) to a specific internal IP address.
* A firewall can block traffic to specific ports on internal computers.
* True: Firewalls can be configured with access control lists (ACLs) or rules to block traffic to specific ports on internal computers, enhancing security by restricting unwanted or harmful traffic.
* A firewall can prevent specific apps from running on a computer.
* False: Firewalls typically control traffic flow and do not prevent specific applications from running on a computer. Application control is usually managed by endpoint security software or application control systems.
* Directing Web Traffic: Firewalls can manage traffic redirection using NAT and port forwarding rules to route web traffic to designated servers or devices within the network.
* Blocking Specific Ports: Firewalls can enforce security policies by blocking or allowing traffic based on port numbers, ensuring that only permitted traffic reaches internal systems.
* Application Control: While firewalls manage network traffic, preventing applications from running typically requires software specifically designed for endpoint protection and application management.
References:
* Understanding Firewalls: Firewall Capabilities
* Network Security Best Practices: Network Security Guide
NEW QUESTION # 40
Which information is included in the header of a UDP segment?
Answer: D
Explanation:
The header of a UDP (User Datagram Protocol) segment includes port numbers. Specifically, it contains the source port number and the destination port number, which are used to identify the sending and receiving applications. UDP headers do not include IP addresses or MAC addresses, as those are part of the IP and Ethernet frame headers, respectively. Additionally, UDP does not use sequence numbers, which are a feature of TCP (Transmission Control Protocol) for ensuring reliable delivery of data segments1.
References :=
* Segmentation Explained with TCP and UDP Header
* User Datagram Protocol (UDP) - GeeksforGeeks
* Which three fields are used in a UDP segment header
* UDP Header: The header of a UDP segment includes the following key fields:
* Source Port: The port number of the sending application.
* Destination Port: The port number of the receiving application.
* Length: The length of the UDP header and data.
* Checksum: Used for error-checking the header and data.
* IP Addresses: These are included in the IP header, not the UDP header.
* Sequence Numbers: These are part of the TCP header, not UDP.
* MAC Addresses: These are part of the Ethernet frame header and are not included in the UDP header.
References:
* RFC 768 - User Datagram Protocol: RFC 768
* Cisco Guide on UDP: Cisco UDP Guide
NEW QUESTION # 41
DRAG DROP
Move each protocol from the list on the left to its correct example on the right.
Answer:
Explanation:
Explanation:
The correct matching of the protocols to their examples is as follows:
DHCP: Assign the reserved IP address 10.10.10.200 to a web server at your company.
DNS: Perform a query to translate companypro.net to an IP address.
ICMP: Perform a ping to ensure that a server is responding to network connections.
Here's how each protocol corresponds to its example:
DHCP (Dynamic Host Configuration Protocol) is used to assign IP addresses to devices on a network.
In this case, DHCP would be used to assign the reserved IP address 10.10.10.200 to a web server.
DNS (Domain Name System) is used to translate domain names into IP addresses. Therefore, to translate companypro.net to an IP address, DNS would be utilized.
ICMP (Internet Control Message Protocol) is used for sending error messages and operational information indicating success or failure when communicating with another IP address. An example of this is using the ping command to check if a server is responding to network connections.
These protocols are essential for the smooth operation of networks and the internet.
Perform a query to translate companypro.net to an IP address.
DNS (Domain Name System): DNS is used to resolve domain names to IP addresses.
Assign the reserved IP address 10.10.10.200 to a web server at your company.
DHCP (Dynamic Host Configuration Protocol): DHCP is used to assign IP addresses to devices on a network.
Perform a ping to ensure that a server is responding to network connections.
ICMP (Internet Control Message Protocol): ICMP is used by network devices to send error messages and operational information, and it is the protocol used by the ping command.
DNS (Domain Name System): DNS translates human-friendly domain names like "companypro.net" into IP addresses that computers use to identify each other on the network.
DHCP (Dynamic Host Configuration Protocol): DHCP automatically assigns IP addresses to devices on a network, ensuring that no two devices have the same IP address.
ICMP (Internet Control Message Protocol): ICMP is used for diagnostic or control purposes, and the ping command uses ICMP to test the reachability of a host on an IP network.
Reference: DNS Basics: What is DNS?
DHCP Overview: What is DHCP?
ICMP and Ping: Understanding ICMP
NEW QUESTION # 42
HOTSPOT
You purchase a new Cisco switch, turn it on, and connect to its console port. You then run the following command:
For each statement about the output, select True or False. Note: You will receive partial credit for each correct selection.
Answer:
Explanation:
Explanation:
The two interfaces are administratively shut down:
False: The output does not show any "shutdown" command under the interfaces, which would indicate that they are administratively shut down. Therefore, they are likely in their default state, which is administratively up.
The two interfaces have default IP addresses assigned:
False: The output does not show any IP address configuration. In the default state, interfaces do not have IP addresses assigned unless explicitly configured.
The two interfaces can communicate over Layer 2:
True: By default, interfaces on a switch are Layer 2 interfaces capable of forwarding Ethernet frames. As there is no configuration provided that changes this, it can be assumed they can communicate over Layer 2.
Interface Status: The absence of the "shutdown" command means the interfaces are not administratively shut down.
IP Address Assignment: There is no evidence in the output that IP addresses have been assigned to the interfaces, which would typically be shown as "ip address" entries.
Layer 2 Communication: Switch interfaces in their default state operate at Layer 2, enabling them to forward Ethernet frames and participate in Layer 2 communication.
Reference: Cisco IOS Interface Configuration: Cisco Interface Configuration
Understanding Cisco Switch Interfaces: Cisco Switch Interfaces
NEW QUESTION # 43
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