最新なJuniper JN0-280問題集（187題）、真実試験の問題を全部にカバー！

質問 1：
What roles do the Designated Router (DR) and Backup Designated Router (BDR) play in OSPF?
A. They redistribute routes between OSPF and non-OSPF networks.
B. They are responsible for generating LSAs for external routes.
C. They determine the shortest path first algorithm.
D. They reduce the number of adjacencies on broadcast networks.
正解：D

質問 2：
What are two consequences of having all network devices in a single collision domain? (Choose two.)
A. The amount of network resource consumption does not change.
B. The chance of packet collision is increased.
C. The amount of network resource consumption is increased.
D. The chance of packet collision is decreased.
正解：B,C
解説: (Pass4Test メンバーにのみ表示されます)

質問 3：
What is the primary purpose of OSPF in network routing?
A. To provide path vector routing within an autonomous system.
B. To encrypt data traffic between different networks.
C. To offer dynamic routing within an autonomous system using link-state information.
D. To redistribute routes between autonomous systems.
正解：C

質問 4：
Which of the following BGP attributes is considered first in the route selection process?
A. MED
B. Local Preference
C. Origin
D. AS Path Length
正解：B

質問 5：
What does the qualified-next-hop feature do when configuring a static route?
A. It instructs the device to looks up a static route s next-hop that is not directly connected.
B. It specifies the IP address of the directly connected device.
C. It instructs the device to verify the next-hop is reachable before activating the route.
D. It allows you to specify an independent route preference value for an additional next hop.
正解：D

質問 6：
When configuring MAC address filtering on a Junos switch, which feature is primarily used?
A. Port security
B. Firewall filters
C. Access Control Lists (ACLs)
D. RADIUS
正解：A

質問 7：
What is the primary purpose of MAC address filtering on a switch?
A. To control the flow of encrypted data.
B. To distribute traffic evenly across multiple links.
C. To prevent unauthorized devices from accessing the network.
D. To limit the rate of incoming packets.
正解：C

質問 8：
MACsec provides protection against which two types of threats? (Choose two.)
A. Playback attacks
B. Data decryption
C. Hashing attacks
D. Man-in-the-middle attack
正解：A,D
解説: (Pass4Test メンバーにのみ表示されます)

質問 9：
What is the primary use of a virtual link in OSPF?
A. To connect OSPF areas to external networks.
B. To connect an OSPF area to the backbone area through a non-backbone area.
C. To encrypt OSPF traffic.
D. To balance load across multiple links.
正解：B