그리고 Itexamdump JN0-351 시험 문제집의 전체 버전을 클라우드 저장소에서 다운로드할 수 있습니다: https://drive.google.com/open?id=1fu0HlS4_tXbZkXwIEtc84i9dPlJPAOzx
Juniper JN0-351인증시험은 현재IT인사들 중 아주 인기 잇는 인증시험입니다.Juniper JN0-351시험패스는 여러분의 하시는 일과 생활에서 많은 도움을 줄뿐만 아니라 중요한 건 여러분의IT업계에서의 자기만의 자리를 지키실 수 잇습니다.이렇게 좋은 시험이니 많은 분들이 응시하려고 합니다,하지만 패스 율은 아주 낮습니다.
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저희 Itexamdump의 덤프 업데이트시간은 업계에서 가장 빠르다고 많은 덤프구매자 분들께서 전해주셨습니다. Juniper JN0-351 덤프도 마찬가지 입니다. 저희는 수시로 덤프업데이트 가능성을 체크하여 덤프를 항상 시중에서 가장 최신버전이 될수있도록 최선을 다하고 있습니다. 구매후 1년무료업데이트서비스를 해드리기에 구매후에도 덤프유효성을 최대한 연장해드립니다.
질문 # 189
Which three actions are required for filter-based forwarding? (Choose three.)
정답：B,D,E
질문 # 190
Which two statements are correct about Junos OS "screen" options used for security purposes on SRX or EX devices? (Choose two.)
정답：A,D
설명：
Screen options provide protection against common network-layer and transport-layer attacks, such as SYN floods, ICMP floods, and IP address spoofing, by detecting anomalous traffic patterns. Screen options are applied at the zone level and inspect traffic as it enters the associated security zone, complementing but not replacing firewall filters, which provide more granular packet matching and filtering capabilities.
질문 # 191
You have DHCP snooping enabled but no entries are automatically created in the snooping database for an interface on your EX Series switch. What are two reasons for the problem? (Choose two.)
정답：C,D
설명：
Explanation
The DHCP snooping feature in Juniper Networks' EX Series switches works by building a binding database that maps the IP address, MAC address, lease time, binding type, VLAN number, and interface information1. This database is used to filter and validate DHCP messages from untrusted sources1.
However, there are certain conditions that could prevent entries from being automatically created in the snooping database for an interface:
MAC limiting: If MAC limiting is enabled on the interface, it could potentially interfere with the operation of DHCP snooping. MAC limiting restricts the number of MAC addresses that can be learned on a physical interface to prevent MAC flooding attacks1. This could inadvertently limit the number of DHCP clients that can be learned on an interface, thus preventing new entries from being added to the DHCP snooping database.
Static IP address: If the device connected to the interface is configured with a static IP address, it will not go through the DHCP process and therefore will not have an entry in the DHCP snooping database1. The DHCP snooping feature relies on monitoring DHCP messages to build its database1, so devices with static IP addresses that do not send DHCP messages will not have their information added.
Therefore, options B and C are correct. Options A and D are not correct because performing a DHCPRELEASE would simply remove an existing entry from the database1, and Dynamic ARP inspection (DAI) uses the information stored in the DHCP snooping binding database but does not prevent entries from being created1.
질문 # 192
What are two characteristics of RSTP alternate ports? (Choose two.)
정답：A,C
설명：
* A is correct because RSTP alternate ports block traffic while receiving superior BPDUs from a neighboring switch. An alternate port is a backup port for a root port, which means it receives better BPDUs from another bridge than the current root port 1 . However, an alternate port does not forward any traffic, as it is in a discarding state 2 . It only listens to BPDUs and waits for the root port to fail. If the root port fails, the alternate port can immediately transition to a forwarding state and become the new root port 1 .
* C is correct because RSTP alternate ports provide an alternate higher cost path to the root bridge. An alternate port is selected based on the same criteria as the root port, which are the lowest bridge ID, the lowest path cost, the lowest sender port ID, and the lowest receiver port ID 3 . However, an alternate port receives a higher cost BPDU than the root port, otherwise it would be the root port itself 1 .
Therefore, an alternate port provides an alternate higher cost path to the root bridge than the root port.
질문 # 193
You are concerned about spoofed MAC addresses on your LAN. Which two Layer 2 security features should you enable to minimize this concern? (Choose two.)
정답：A,D
설명：
A is correct because dynamic ARP inspection (DAI) is a Layer 2 security feature that prevents ARP spoofing attacks. ARP spoofing is a technique that allows an attacker to send fake ARP messages to associate a spoofed MAC address with a legitimate IP address. This can result in traffic redirection, man-in-the-middle attacks, or denial-of-service attacks. DAI validates ARP packets by checking the source MAC address and IP address against a trusted database, which is usually built by DHCP snooping. DAI discards any ARP packets that do not match the database or have invalid formats. C is correct because DHCP snooping is a Layer 2 security feature that prevents DHCP spoofing attacks. DHCP spoofing is a technique that allows an attacker to act as a rogue DHCP server and offer fake IP addresses and other network parameters to unsuspecting clients. This can result in traffic redirection, man-in-the-middle attacks, or denial-of-service attacks. DHCP snooping filters DHCP messages by classifying switch ports as trusted or untrusted. Trusted ports are allowed to send and receive any DHCP messages, while untrusted ports are allowed to send only DHCP requests and receive only valid DHCP replies from trusted ports. DHCP snooping also builds a database of MAC addresses, IP addresses, lease times, and binding types for each client.
질문 # 194
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Juniper인증JN0-351시험을 위하여 최고의 선택이 필요합니다. Itexamdump 선택으로 좋은 성적도 얻고 하면서 저희 선택을 후회하지 않을것니다.돈은 적게 들고 효과는 아주 좋습니다.우리Itexamdump여러분의 응시분비에 많은 도움이 될뿐만아니라Juniper인증JN0-351시험은 또 일년무료 업데이트서비스를 제공합니다.작은 돈을 투자하고 이렇게 좋은 성과는 아주 바람직하다고 봅니다.
JN0-351퍼펙트 덤프 최신 데모문제: https://www.itexamdump.com/JN0-351.html
그리고 Itexamdump JN0-351 시험 문제집의 전체 버전을 클라우드 저장소에서 다운로드할 수 있습니다: https://drive.google.com/open?id=1fu0HlS4_tXbZkXwIEtc84i9dPlJPAOzx