Free CCST-Networking Questions Attempt

Router

Theshow running-configcommand is used on a Cisco router to display the current operational settings that are actively configured in the router’s RAM. This command outputs all the configurations that are currently being executed by the router, which includes interface configurations, routing protocols, access lists, and other settings. Unlikeshow startup-config, which shows the saved configuration that the router will use on the next reboot,show running-configreflects the live, current configuration in use.

References:= The information is supported by multiple sources that detail the use of Cisco commands, particularly theshow running-configcommand as the standard for viewing the active configuration on a Cisco device123.

• show running-config: This command displays the current configuration running on the router. It includes all the operational settings and configurations applied to the router.
• show protocols: This command shows the status of configured protocols on the router but not the entire configuration.
• show startup-config: This command displays the configuration saved in NVRAM, which is used to initialize the router on startup, but not necessarily the current running configuration.
• show version: This command provides information about the router's software version, hardware components, and uptime but does not display the running configuration.

References:

• Cisco IOS Commands: Cisco IOS Commands

The CIDR (Classless Inter-Domain Routing) notation for the subnet mask 255.255.252.0 is /22. This notation indicates that the first 22 bits of the IP address are used for network identification, and the remaining bits are used for host addresses within the network1.

References :=

•Subnet Cheat Sheet – 24 Subnet Mask, 30, 26, 27, 29, and other IP Address CIDR Network References

=========================

•Subnet Mask to CIDR Notation: The given subnet mask is 255.255.252.0. To convert this to CIDR notation:

•Convert the subnet mask to binary: 11111111.11111111.11111100.00000000

•Count the number of consecutive 1s in the binary form: There are 22 ones.

•Therefore, the CIDR notation is /22.

References:

•Understanding Subnetting and CIDR: Cisco CIDR Guide

The private IP address ranges that are set aside specifically for use within private networks and not routable on the internet are as follows:

• Class A: 10.0.0.0 to 10.255.255.255
• Class B: 172.16.0.0 to 172.31.255.255
• Class C: 192.168.0.0 to 192.168.255.255

These ranges are defined by the Internet Assigned Numbers Authority (IANA) and are used for local communications within a private network123.

Given the options: A.172.16.0.0 to 172.31.255.255falls within the Class B private range. B.192.16.0.0 to 192.16.255.255is not a recognized private IP range. C.11.0.0.0 to 11.255.255.255is not a recognized private IP range. D.192.168.0.0 to 192.168.255.255falls within the Class C private range.

Therefore, the correct selections that the company should use for their private networks areAandD.

References:=

• Reserved IP addresses on Wikipedia
• Private IP Addresses in Networking - GeeksforGeeks
• Understanding Private IP Ranges, Uses, Benefits, and Warnings

OSI model

During the data encapsulation process, theData Link layerof 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