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Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q103-Q108):

NEW QUESTION # 103
Which route is preferred by the Junos OS software routing tables?

A. BGP
B. Static
C. Aggregate
D. Direct

Answer: D

Explanation:
In Junos OS, direct routes are the most preferred routes in the routing table, having the highest priority.
Step-by-Step Breakdown:
Direct Routes:
Direct routes represent networks that are directly connected to the router's interfaces. Since these routes are directly accessible, they are assigned the highest priority and always take precedence over other types of routes.
Preference Values:
Direct routes have a preference of 0, which is the most preferred in Junos. Static routes, OSPF routes, and BGP routes have higher preference values and will only be used if there are no direct routes to the destination.
Juniper Reference:
Direct Route Preference: In Junos, direct routes are always preferred over other routes, ensuring that the router forwards traffic through locally connected networks.

NEW QUESTION # 104
Layer 2 interfaces operate in which two modes? (Choose two.)

A. Trunk
B. Tagged
C. Modular
D. Access

Answer: A,D

Explanation:
Comprehensive Detailed Step by Step Explanation with all Juniper Data Center References Layer 2 interfaces on a switch operate in two key modes: Access and Trunk.
Step-by-Step Breakdown:
Access Mode:
Access ports are used to connect end devices, like PCs or servers, and they are assigned to a single VLAN. These interfaces handle untagged traffic and do not pass VLAN tags.
Example: A port assigned to VLAN 10 will only handle traffic for that VLAN.
Trunk Mode:
Trunk ports are used to connect switches or other networking devices that need to handle traffic from multiple VLANs. Trunk interfaces carry tagged traffic, allowing multiple VLANs to traverse the same physical link.
Trunk ports typically use 802.1Q VLAN tagging to differentiate between VLANs.
Juniper Reference:
Access and Trunk Ports: Juniper switches use these modes to manage VLAN traffic at Layer 2, with access ports handling untagged traffic and trunk ports handling tagged traffic from multiple VLANs.

NEW QUESTION # 105
Which statement about switches is correct?

A. Every port is in a unique collision domain.
B. Each port is in a unique broadcast domain by default.
C. All ports reside in the same collision domain.
D. Each port is a member of VLAN 2 by default.

Answer: A

Explanation:
Each port on a modern switch creates a separate collision domain. This allows multiple devices to communicate simultaneously without collisions on different ports.
Step-by-Step Breakdown:
Collision Domain:
A collision domain is a network segment where data packets can collide if two devices send packets simultaneously.
On a switch, each port creates a separate collision domain, so collisions only occur if two devices connected to the same port (through a hub, for instance) try to send data at the same time. Switches vs Hubs:
Unlike hubs, which have one large collision domain, switches isolate collisions to individual ports, improving performance.
Juniper
Reference: Switch Port Behavior: In Juniper switches, each port operates in its own collision domain, enhancing network efficiency by reducing the chances of packet collisions.

NEW QUESTION # 106
MACsec provides protection against which two types of threats? (Choose two.)

A. Playback attacks
B. Man-in-the-middle attack
C. Hashing attacks
D. Data decryption

Answer: A,B

Explanation:
MACsec (Media Access Control Security) provides data confidentiality, integrity, and origin authenticity at Layer 2, protecting against several types of threats.
Step-by-Step Breakdown:
Man-in-the-Middle Attack Protection:
MACsec encrypts traffic at Layer 2, preventing man-in-the-middle attacks where an attacker intercepts and manipulates traffic between two communicating devices. Since the data is encrypted, any intercepted packets are unreadable.
Protection Against Playback Attacks:
MACsec also protects against playback attacks by using sequence numbers and timestamps to ensure that old, replayed packets are not accepted by the receiver.
Juniper Reference:
MACsec Configuration: Juniper devices support MACsec for securing Layer 2 communications, ensuring protection against replay and man-in-the-middle attacks in sensitive environments.

NEW QUESTION # 107
What is the primary purpose of OSPF in network routing?

A. To encrypt data traffic between different networks.
B. To redistribute routes between autonomous systems.
C. To provide path vector routing within an autonomous system.
D. To offer dynamic routing within an autonomous system using link-state information.

Answer: D

NEW QUESTION # 108
......

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