单选题 考虑到用户报文在Gn/Gp口可能经过多层隧道封装，为了避免报文分片，推荐在xGW GGSN的APN配置中将Max Segment Size (MSS)设为（ ）。 In consideration that user packets are encapsulated through multi-layer tunnels on the Gn/Gp interface, to avoid packet segments, it is recommended to set Max Segment Size (MSS) in APN configuration on the xGW GGSN to ( ).

单选题 ZXUN-xGW GGSN一块GSU单板最多可以配置（ ）个CPU。 On the ZXUN-xGW GGSN, one GSU board can be configured with ( ) CPUs at most.

单选题 ZXUN-xGW GGSN使用VRF隔离不同业务流量，其中Gn口的vrf名称为Gnvrf。查询Gn口路由表的命令为（ ）。 VRF is used on the ZXUN-xGW GGSN to isolate traffic of different services, and the VRF of the Gn interface is named as Gnvrf. To query routing tables of the Gn interface, run the ( ) command.

单选题 ZXUN xGW-16机框中，16～19槽位只能插入（ ）单板。 On the ZXUN xGW-16 shelf, slot 16-19 can only be installed with the ( ) board.

单选题 ZXUN xGW-16机框中，总共有（ ）个业务槽位可用于插入GSU/CSU/PFU单板。 On the ZXUN xGW-16 shelf, altogether ( ) service slots can be installed with GSU/CSU/PFU boards.

单选题 ZXUN xGW-16机框中，一块PFU单板最大带宽为（ ）。 On the ZXUN xGW-16 shelf, the maximum bandwidth of a PFU board is ( ).

单选题 ZXUN-xGW GGSN PFU接口可配置的MAC地址偏移范围是（ ）。 Which is the range of MAC offset configured for the PFU interface on the xGW GGSN? ( )

单选题 ZXUN-xGW GGSN配置了NTP时间同步，其中时间同步间隔配置为ntp poll-interval 10，则GGSN每隔（ ）同步一次。 If NTP synchronization is configured on the ZXUN-xGW GGSN, and the time synchronization interval “ntp poll-interval” is set to "10", the GGSN synchronizes clock once every ( ).