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A security zone can contain multiple interfaces.  A security zone may contain no interfaces.  An interface can only belong to one security zone.  Logical interfaces cannot be added to system-defined security zones, they must be added to userdefined security zones.  Further reading -  https://www.juniper.net/documentation/en_US/junos/topics/topic-map/security-zone-configuration.html

Further reading - https://www.juniper.net/uk/en/products-services/security/srx-series/vsrx/ https://www.juniper.net/uk/en/products-services/security/srx-series/datasheets0489.page

Host inbound traffic controls traffic that is destined for the Junos device itself. SSH traffic terminates on the device itself and must be allowed as host inbound traffic.  Further reading -  https://www.juniper.net/documentation/en_US/junos/topics/reference/configuration-statement/security-edit-host-inbound-traffic.html

     Further reading -  https://www.juniper.net/documentation/en_US/junos/topics/topic-map/junos-os-login-class.html

Management interfaces are the primary interfaces for accessing the device remotely. Typically, a management interface is not connected to the in-band network, but is connected instead to the device's internal network. Through a management interface you can access the device over the network using utilities such as ssh and telnet and configure the device from anywhere, regardless of its physical location.  Most of SRX Series devices contain an fxp0 interface.  Further reading -  https://www.juniper.net/documentation/en_US/junos/topics/topic-map/security-chassis-cluster-management-interfaces.html

user@root> show security flow status  Flow forwarding mode: Inet forwarding mode: flow based Inet6 forwarding mode: drop MPLS forwarding mode: drop ISO forwarding mode: drop Advanced services data-plane memory mode: Default Flow trace status  Flow tracing status: off Flow session distribution  Distribution mode: RR-based Flow ipsec performance acceleration: off Flow packet ordering  Ordering mode: Hardware Further reading - https://kb.juniper.net/InfoCenter/index?page=content&id=KB30461

The predefined login classes found on an SRX device are: operator  read-only  superuser or super-user  unauthorized  Further readinghttps://www.juniper.net/documentation/en_US/junos/topics/topic-map/junos-os-login-class.html

An interface can be configured with an IPv4 address, IPv6 address, or both.  Further reading -  https://www.juniper.net/documentation/en_US/junos/topics/topic-map/security-zone-configuration.html

Firewall filters are stateless in nature and can be used to regulate incoming traffic on a packet-by-packet basis.  Further reading -  https://www.juniper.net/documentation/en_US/junos/topics/concept/firewall-filter-stateless-overview.html

An SRX device can operate in two different modes: packet mode and flow mode. In flow mode, SRX processes all traffic by analyzing the state or session of traffic. This is also called stateful processing of traffic. In packet mode, SRX processes the traffic as a traditional router on a per-packet basis. This is also known as stateless processing of traffic. Security features like IPsec, NAT, UTM, and so on, do not work in packet mode. By default, Junos OS on SRX devices works in flow mode.  Also, firewall filters work on a per-packet basis.  Further reading - https://kb.juniper.net/InfoCenter/index?page=content&id=KB30461