A customer’s MSR router is connected to the Internet through the WAN interface S1/0, and to the office network through the LAN interface GE0/0. At present, office network users can access the Internet normally.
Add the following ACL configuration on the router:
firewall enable
firewall default deny
# acl number 3003
rule 0 deny icmp
rule 5 permit tcp destination-port eq 20
#
interface GigabitEthernet0/0
firewall packet-filter 3000 inbound
firewall packet-filter 3000 outbound
So ______ .

Divide a class C network segment into subnets. If the subnet mask is 28 bits, then the maximum number of hosts that can be accommodated in each subnet is ____. (Please fill in Arabic numerals)

The three MSR routers RTA, RTB, and RTC are connected to the same frame relay network through their respective S1/0 interfaces. This frame relay network can provide enough PVC resources. As a network engineer, you need to assign IP addresses to these frame relay interfaces.
Which of the following statements is incorrect?

If you want to upgrade the router but do not have a network cable, you can use the configuration cable and use the ______ protocol to upgrade through HyperTerminal.

The main link of the WAN of a company's MSR router is a synchronous and asynchronous serial port, which is connected to the operator's network through a V.35 cable; the router also uses an ISDN BRI interface as a backup link.
Regarding the line bandwidth, which of the following statements are correct? (multiple choice)