The customer's network connection looks like:
HostA----GE0/0--MSR-1--S1/0-----WAN----S1/0--MSR-2--GE0/0----HostB
On the WAN interface S1/0 of the two routers MSR-1 and MSR-2, only the PPP protocol is encapsulated and the IP address is configured. Currently, HostA and HostB can ping each other. Add the command ppp authentication-mode chap under MSR-1 interface S1/0, and then execute shutdown and undo shutdown operations on S1/0 of MSR-1.
So ______ . (Multiple choice)

The equipment that realizes network interconnection at the network layer is ______.

The MSR router exchanges routing information with the outside world through RIPv2. There are three routes 10.1.1.0/24, 10.1.2.0/24, 10.1.3.0/24 in the routing table, then the following RIP configuration is added to the router:
[MSR-rip-1] summary
Then the router will send out the route of which network segment as follows?

The correct statement about STP, RSTP and MSTP is ______. (Multiple choice)

During the establishment of the TCP connection as shown in the figure, the Y part of SYN should be filled with ________.