Exam 350-701 topic 1 question 625 discussion

2 separate listeners on 2 logical IPv4 and 2 IPv6 addresses configured on separate physical interfaces segregates incoming and outgoing traffic you can assign an IPv4 and an IPv6 address to each listener

Segregating Incoming and Outgoing Mail You can segregate incoming and outgoing email traffic over separate listeners and on separate IP addresses. You can use Internet Protocol version 4 (IPv4) and version 6 (IPv6) addresses. However, the System Setup Wizard on the email gateway supports initial configuration of the following configurations: 2 separate listeners on 2 logical IPv4 and 2 IPv6 addresses configured on separate physical interfaces segregates incoming and outgoing traffic you can assign an IPv4 and an IPv6 address to each listener 1 listener on 1 logical IPv4 address configured on one physical interface combines both incoming and outgoing traffic you can assign both an IPv4 and an IPv6 address to the listener https://www.cisco.com/c/en/us/td/docs/security/esa/esa14-0/user_guide/b_ESA_Admin_Guide_14-0/b_ESA_Admin_Guide_12_1_chapter_010.html