Juniper Updated JN0-636 Exam Questions and Answers by abeeha

The exhibit shows the output of the show security macsec statistics interface ge-0/0/70 detail command on an SRX Series device. This command displays the statistics for the Media Access Control Security (MACsec) feature on the ge-0/0/70 interface. MACsec is a feature that provides point-to-point security on Ethernet links by using encryption and data integrity checks. MACsec uses two types of keys to secure the traffic: the Connectivity Association Key (CAK) and the Secure Association Key (SAK). The CAK is used for authentication and key exchange between the MACsec peers. The SAK is used for encryption and decryption of the MACsec traffic.

The two statements that are true based on the exhibit are:

• The data that traverses the ge-0/0/70 interface is secured by a secure association key. This is because the exhibit shows that the interface has a Secure Channel (SC) and a Secure Association (SA) established. The SC is a logical connection between the MACsec peers that carries the encrypted traffic. The SA is a subset of the SC that contains the SAK and other parameters for encrypting and decrypting the traffic. The exhibit shows that the interface has encrypted and protected packets, which means that the traffic is secured by the SAK.
• The data that traverses the ge-0/0/70 interface cannot be intercepted and read by anyone. This is because the exhibit shows that the interface has encryption enabled. The encryption option indicates whether the MACsec traffic is encrypted or not. If encryption is enabled, the traffic is encrypted by the SAK and cannot be viewed by anyone monitoring the link. If encryption is disabled, the traffic is only protected by the SAK and can be viewed by anyone monitoring the link.

References: Juniper Security, Professional (JNCIP-SEC) Reference Materials source and documents: https://www.juniper.net/documentation/en_US/junos/topics/reference/command-summary/show-security-macsec-statistics-interface-detail.html https://www.juniper.net/documentation/en_US/junos/topics/concept/security-macsec-overview.html

• The source address is translated because the traceoptions output shows that the source IP address 192.168.5.2 is translated to 192.168.100.1 and the source port 0 is translated to 14777. The traceoptions output also shows the flag flow_first_src_xlate, which indicates that this is the first time that source NAT is applied to this session.
• The packet is an SSH packet because the traceoptions output shows that the application protocol is tcp/22, which is the default port for SSH. The traceoptions output also shows the flag flow_tcp_syn, which indicates that this is the first packet of a TCP connection.

References:

• traceoptions (Security NAT) | Junos OS | Juniper Networks
• [SRX] How to interpret Flow TraceOptions output for NAT troubleshooting

A company wants to partition their physical SRX series firewall into multiple logical units and assign each unit (tenant) to a department within the organization. You are the primary administrator of the firewall and a colleague is the administrator for one of the departments. The two statements that are correct about your colleague are:

• B. The colleague can access and view the resources of the tenant system. A tenant system is a type of logical system that is created and managed by the primary administrator of the firewall. A tenant system has its own discrete administrative domain, logical interfaces, routing instances, security policies, and other features. The primary administrator can assign a tenant system to a department within the organization and delegate the administration of the tenant system to a colleague. The colleague can access and view the resources of the tenant system, such as the allocated CPU, memory, and bandwidth, and the configured interfaces, zones, and policies1.
• C. The colleague can create and assign logical interfaces to the tenant system. A logical interface is a software interface that represents a subset of the physical interface. A logical interface can have its own address, encapsulation, and routing parameters. The primary administrator can allocate a number of logical interfaces to a tenant system and allow the colleague to create and assign logical interfaces to the tenant system. The colleague can configure the logical interfaces with the appropriate address, encapsulation, and routing parameters for the tenant system2.

The other statements are incorrect because:

• A. The colleague cannot configure the resources allocated and routing protocols. The resources allocated and routing protocols are configured by the primary administrator of the firewall. The primary administrator can allocate a fixed amount of resources, such as CPU, memory, and bandwidth, to a tenant system and specify the routing protocols that are allowed for the tenant system. The colleague cannot modify the resources allocated or routing protocols for the tenant system1.
• D. The colleague cannot modify the number of allocated resources for the tenant system. The number of allocated resources for the tenant system is configured by the primary administrator of the firewall. The primary administrator can allocate a fixed amount of resources, such as CPU, memory, and bandwidth, to a tenant system and monitor the resource usage of the tenant system. The colleague cannot modify the number of allocated resources for the tenant system1.

References:

• Understanding Tenant Systems
• Understanding Logical Interfaces