After the show ip route command has been entered, the f……

单项选择题What is the purpose of this command? ip route 0.0.0.0 0.0.0.0 serial0 0（）

A. It configures a router to send all packets out interface serial 0/0.
B. It configures a router to block routing updates from being sent out interface serial 0/0.
C. It configures a router as a firewall, blocking all unauthorized packets from exiting serial 0/0.
D. It configures a router to send all packets for unknown destination networks out interface serial 0/0.
E. It configures a router to drop all packets for which the destination network is unknown.

单项选择题What is the purpose of the command shown below?vtp password Fl0r1da（）

A. It is used to validate the sources of VTP advertisements sent between switches.
B. It is used to access the VTP server to make changes to the VTP configuration.
C. It allows two VTP servers to exist in the same domain, each configured with different passwords.
D. It is the password required when promoting a switch from VTP client mode to VTP server mode.
E. It is used to prevent a switch newly added to the network from sending incorrect VLAN information to the other switches in the domain.

单项选择题A company is experiencing network delays. The network administrator discovers that a worker in a location far from the MDF has connected an old 10BASE-T switch with redundant links to the existing network. How could this action be responsible for the impaired network performance?（）

A. Connecting a host to the old switch has created a broadcast storm.
B. The 10BASE-T switch forced the entire network to be reduced to 10 Mbps operation.
C. The old switch does not support VLANs, which has disabled the VLAN configuration of the entire the network.
D. The old switch does not support full-duplex operation, effectively forcing half-duplex operation throughout the network.
E. Spanning Tree Protocol has elected the old switch as the root bridge, creating inefficient data paths through the switched network.

多项选择题Which of the following services use TCP?（）

A.DHCP
B.SMTP
C.SNMP
D.FTP
E.HTTP
F.TFTP

多项选择题Refer to the router topology shown in the graphic. Assuming that all routers are running OSPF, which statements correctly describe how the routers exchange routing information?（）

A. Denmark exchanges with Utah, Paris, and Berlin.
B. Utah exchanges only with Denmark.
C. Berlin exchanges with Denmark, Utah, and Paris.
D. Paris exchanges only with Denmark.
E. Denmark exchanges with only Paris and Utah.