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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Sharding and Scalability | 10% | - Shard keys, chunk management, balancing - Sharded cluster architecture - Query routing and cluster operations |
| Topic 2: Replication and High Availability | 15% | - Deployment and maintenance of replica sets - Replica set architecture and components - Failover, elections, read/write concern |
| Topic 3: MongoDB Architecture and Deployment | 20% | - Installation and configuration - Core concepts, JSON/BSON, data model - Storage engines and server management |
| Topic 4: Backup, Recovery and Maintenance | 10% | - Data consistency and integrity checks - Logical and physical backup methods - Restore procedures and disaster recovery |
| Topic 5: Security and Access Control | 15% | - Authentication mechanisms - Encryption, auditing, and security best practices - Role-based access control |
| Topic 6: Monitoring, Performance and Troubleshooting | 10% | - Diagnostics and resolving common issues - Performance tuning and optimization - Monitoring tools and metrics |
| Topic 7: CRUD Operations and Indexing | 20% | - Query optimization and aggregation - Create, Read, Update, Delete operations - Index types, creation, and management |
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NEW QUESTION # 163
What is a limitation of encryption at rest?
Answer: A
Explanation:
Encryption at rest protects persisted database data on storage media, but it is not a complete defense against every form of data exposure or breach. MongoDB ' s encrypted storage capabilities protect files and storage- level data, yet applications and the database server must still process authorized data in usable form. A compromised application account, stolen database credentials, excessive privileges, or a malicious authorized user can therefore expose data even when the underlying storage is encrypted. Network traffic also requires separate transport protection such as TLS; encryption at rest does not secure data as it travels between clients and servers. Option B incorrectly describes transport encryption rather than an at-rest capability. Option A is too subjective and not an inherent limitation, particularly in managed deployments where storage encryption may be enabled automatically. Option D is similarly overstated; encryption adds cryptographic work, but severe performance impact is not an intrinsic defining limitation. The correct security model is defense in depth: combine at-rest encryption with TLS, strong authentication, least-privilege authorization, auditing, and secure key management. Among the choices, C best captures the limitation that at-rest encryption alone cannot prevent all data breaches.
Study Guide reference/topic:Security, Networking, and Encryption - encryption at rest, TLS, authorization, and defense in depth.
NEW QUESTION # 164
A MongoDB administrator needs to create a new role with only the read privileges for the products database.
What command should the administrator use?
Answer: A
Explanation:
MongoDB custom roles are defined in terms of privileges, and each privilege specifies a resource plus one or more allowed actions. For read/query access, find is a valid privilege action. To represent all normal collections in a specified database, MongoDB uses a resource document with the target database and an empty collection name, for example { db: " products " , collection: " " }. Option B therefore combines the correct resource scope with the find action and does not grant write capability. The distractors confuse built-in role names with privilege actions. read, readWrite, and readAnyDatabase are built-in roles or role concepts, not the appropriate action values for the privileges[].actions list shown here. Likewise, a literal " * " collection value is not the documented database-wide resource form for this custom privilege. In practice, an administrator could also assign MongoDB ' s built-in read role rather than creating a custom role if its permissions exactly match the requirement. Given the specific createRole() choices, however, option B is the technically correct construction.
Study Guide reference/topic:Security, Networking, and Encryption - RBAC, custom roles, resources, and privilege actions.
NEW QUESTION # 165
What does the following query do when performed on the posts collection? db.posts.update({_id:l},{Title:This is post with ID 1"})
Answer: A
NEW QUESTION # 166
Which TWO commands can be used to remove the role, " specialRole " from " user1 " ?
Answer: A,D
Explanation:
The documented mongosh helper is db.revokeRolesFromUser(), and its second argument is an array of roles to revoke. MongoDB permits each role in that array to be expressed either as an explicit document { role: < roleName > , db: < database > } or, when the role belongs to the database in which the command is run, as a simple role-name string. Option C uses the explicit role-document form and is therefore valid for a role named specialRole defined in myDB. Option E uses the shorthand string form and is valid when specialRole is in the current database context. Option A reverses the required document structure and does not supply the mandatory role and db keys. Options B and D use a singular helper, db.revokeRoleFromUser(), which is not the documented MongoDB method. The plural method name reflects that multiple roles can be revoked in a single operation. Administrators should also remember that revoking a directly assigned role does not necessarily remove privileges inherited through other roles. Among the choices, C and E are the syntactically valid revocation forms.
Study Guide reference/topic:Security, Networking, and Encryption - RBAC, user administration, and revokeRolesFromUser().
NEW QUESTION # 167
Which command can be used to rebuild the indexes on a collection in MongoDB?
Answer: A
NEW QUESTION # 168
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