A. Which of the following protects SNMP-managed devices from unauthorized access?
a. Community string
b. X.500 lite
C.
d. Resource records
B. A DNS query issued via IPv4 can only return IPv4 addresses, IPv6 addresses can only be returned if the DNS query is done via IPv6.
Select one:
True
False
The correct answer and explanation is:
Answers:
A. The correct answer is: a. Community string
B. The correct answer is: False
Explanation:
A. SNMP Security and Community Strings
Simple Network Management Protocol (SNMP) is used to manage network devices like routers, switches, and servers. SNMP allows administrators to monitor and configure devices remotely. To protect these devices from unauthorized access, SNMP uses a community string, which acts as a password to authenticate and control access.
- Community strings exist in SNMP versions 1 and 2c and function as plaintext passwords.
- There are two types of community strings:
- Read-Only (RO): Allows users to view configurations but not change them.
- Read-Write (RW): Allows both viewing and modifying device settings.
- SNMP v3 provides better security with authentication and encryption.
Other choices, such as X.500 lite (a directory service protocol) and Resource records (used in DNS), are unrelated to SNMP security.
B. DNS Queries and IP Address Types
The statement “A DNS query issued via IPv4 can only return IPv4 addresses, and IPv6 addresses can only be returned if the DNS query is done via IPv6.” is false.
DNS (Domain Name System) is responsible for resolving domain names into IP addresses. It can store both IPv4 (A records) and IPv6 (AAAA records).
- When a DNS client queries a server, it can request both A and AAAA records.
- Even if a DNS query is sent over IPv4, it can return an IPv6 address.
- Similarly, a query sent over IPv6 can return an IPv4 address.
For example:
- Query for
example.comover IPv4 can still retrieve AAAA (IPv6) records. - Query over IPv6 can retrieve A (IPv4) records.
Modern DNS servers handle both record types, ensuring smooth IPv4-IPv6 compatibility.
Generated Image:
I will now generate an image to illustrate the concept of DNS queries for IPv4 and IPv6.
Here is the generated image illustrating how a DNS server can return both IPv4 and IPv6 addresses regardless of the connection type. Let me know if you need further clarifications!
