Question # 1
| Which of the following is used to describe the average duration of an outage for a specific service? | | A. RPO | | B. MTTR | | C. RTO | | D. MTBF |
B. MTTR
Explanation:
Explanation: MTTR (Mean Time to Repair) is the average time it takes to repair a system or service after a failure. It helps in measuring the downtime and planning recovery processes.
Question # 2
| A network engineer is designing a secure communication link between two sites. The entire data stream needs to remain confidential. Which of the following will achieve this goal? | | A. GRE | | B. IKE | | C. ESP | | D. AH |
C. ESP
Explanation:
Definition of ESP (Encapsulating Security Payload):
ESP is a part of the IPsec protocol suite designed to provide confidentiality, integrity, and authenticity of data by encrypting the payload and optional ESP trailer.
Ensuring Confidentiality:
Encryption: ESP encrypts the payload, ensuring that the data remains confidential during transmission. Only authorized parties with the correct decryption keys can access the data.
Modes of Operation: ESP can operate in transport mode (encrypts only the payload) or tunnel mode (encrypts the entire IP packet), both providing strong encryption to secure data between sites.
Comparison with Other Protocols:
GRE (Generic Routing Encapsulation): A tunneling protocol that does not provide encryption or security features.
IKE (Internet Key Exchange): A protocol used to set up a secure, authenticated communications channel, but it does not encrypt the data itself.
AH (Authentication Header): Provides integrity and authentication for IP packets but does not encrypt the payload.
Implementation:
Use ESP as part of an IPsec VPN configuration to encrypt and secure communication between two sites. This involves setting up IPsec policies and ensuring both endpoints are configured to use ESP for data encryption.
References:
CompTIA Network+ study materials on IPsec and secure communication protocols.
Question # 3
| network administrator needs to divide 192.168.1.0/24 into two equal halves. Which of the following subnet masks should the administrator use? | | A. 255.255.0.0 | | B. 255.255.254.0 | | C. 255.255.255.0 | | D. 255.255.255.128 |
D. 255.255.255.128
Understanding Subnetting: Calculating Subnet Mask: Verification: Comparison with Other Options: References: CompTIA Network+ study materials on subnetting and IP addressing.
Question # 4
An administrator is configuring a switch that will be placed in an area of the office that is accessible to customers. Which of the following is the best way for the administrator to mitigate unknown devices from connecting to the network?
| A. SSE
| B. ACL
| C. Perimeter network
| D. 802.1x
|
D. 802.1x
Explanation:
802.1x is a network access control protocol that provides an authentication mechanism to devices trying to connect to a LAN or WLAN. This ensures that only authorized devices can access the network, making it ideal for mitigating the risk of unknown devices connecting to the network, especially in accessible areas.
802.1x Authentication: Requires devices to authenticate using credentials (e.g., username and password, certificates) before gaining network access.
Access Control: Prevents unauthorized devices from connecting to the network, enhancing security in public or semi-public areas.
Implementation: Typically used in conjunction with a RADIUS server to manage authentication requests.
Network References:
CompTIA Network+ N10-007 Official Certification Guide: Covers 802.1x and its role in network security.
Cisco Networking Academy: Provides training on implementing 802.1x for secure network access control.
Network+ Certification All-in-One Exam Guide: Explains the benefits and configuration of 802.1x authentication in securing network access.
Question # 5
| A network administrator needs to change where the outside DNS records are hosted. Which of the following records should the administrator change the registrar to accomplish this task? | | A. NS | | B. SOA | | C. PTR | | D. CNAME |
A. NS
Explanation:
To change where the outside DNS records are hosted, the network administrator needs to update the NS (Name Server) records at the domain registrar. NS records specify the authoritative name servers for a domain, directing where DNS queries should be sent.
NS (Name Server) Records: These records indicate the servers that are authoritative for a domain. Changing the NS records at the registrar points DNS resolution to the new hosting provider.
SOA (Start of Authority): Contains administrative information about the domain, including the primary name server.
PTR (Pointer) Records: Used for reverse DNS lookups, mapping IP addresses to domain names.
CNAME (Canonical Name) Records: Used to alias one domain name to another, not relevant for changing DNS hosting.
Network References:
CompTIA Network+ N10-007 Official Certification Guide: Discusses DNS records, their purposes, and how to manage them.
Cisco Networking Academy: Provides training on DNS management and the role of different DNS record types.
Network+ Certification All-in-One Exam Guide: Explains DNS records and their configuration for domain management.
Question # 6
| Which of the following is most commonly associated with many systems sharing one IP address in the public IP-addressing space? | | A. PAT | | B. NAT | | C. VIP | | D. NAT64 |
A. PAT
Explanation:
Explanation: Port Address Translation (PAT) allows multiple internal devices to share a single public IP address by assigning each device a unique port number. This is the most common method used in environments where many systems need internet access but there are limited public IP addresses.
Question # 7
| Which of the following allows a remote user to connect to the network? | | A. Command-line interface | | B. API gateway | | C. Client-to-site VPN | | D. Jump box |
C. Client-to-site VPN
Explanation:
Explanation: A Client-to-Site VPN allows a remote user to securely connect to a company's internal network, providing access as if they were physically on-site.
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