MOC H12 v1

What problems may Layer 2 network loops cause?. Broadcast storm. MAC address table flapping. Duplicate data frames. Sharp increase in CPU usage.

The IPv4 address space is divided into five classes: A, B, C, D, and E. Class D IP addresses are multicast addresses ranging from 221.0.0.0 to 239.255.255.255. True. False.

If the network address is 10.1.1.0/30, then the corresponding broadcast address is ( )?. 10.1.1.1. 10:1:1.2. 10.1.1.3. 10.1.1.4.

Which of the following IP addresses cannot directly communicate with IP address 192.168.1.1/18, and requires a gateway to forward data packets to 192.168.1.1/18?. 192.168.5.5/16. 192.168.15.253/20. 192.168.127.1/8. 192.168.31.1/18.

lf the broadcast address is 172.16.9.255, then the corresponding network address may be ( ). 172.16.2.0/24. 172.16.1.252/30. 172.16.8.0/23. 172.16.1.0/26.

172.16.0.255 is the broadcast address of the network segment 172.16.0.0/16. True. False.

Which of the following statements about ICMP packets are true?. ICMP is a network-layer protocol. An ICMP packet is encapsulated in an IP data packet and is not encapsulated at the transport layer. ICMP does not support redirection. ICMP packets cannot be used to detect the path MTU.

Tracert is a typical application of ICMP. True. False.

ICMP is used to transmit error and control information between network devices. ICMP defines multiple types of message, including ( )?. Network Unreachable. Echo Reply. Echo Request. Host Unreachable.

There are two routers between a source device and a destination device, and the tracert command is executed to check the path connectivity. To check the first hop, the source device sends a UDP packet with a TTL value of 1 and a larger UDP port number to the destination device. When the packet arrives at the first router, the TTL value changes to 0. In this scenario, which of the following ICMP messages will the first router send to the source device?. Time Exceeded. Echo Request. Echo Reply. Port Unreachable.

Which of the following technologies enhances device security by converting the MAC addresses dynamically learned by a port into secure MAC addresses?. SEP. Port Security. ACL. NAT.

A Layer 2 switch builds a MAC address table by reading the destination MAC addresses in data packets. True. False.

Which of the following are multicast MAC addresses?. 00-1E-10-DD-DD-02. FF-FE-FE-FF-FF-FF. 01-80-C2-00-00-01. 33-33-00-00-00-01.

Which of the following statements is false about the functions of gratuitous ARP packets?. Checks for duplicate IP addresses: In normal situations, a host does not receive an ARP Reply packet after sending an ARP Request packet with the destination address as its own IP address. If the host receives an ARP Reply packet, another host is using the same IP address. Advertises a new MAC address: If the MAC address of a host is changed because its network adapter is replaced, the host sends a gratuitous ARP packet to notify all other hosts of the change before the ARP entry for the old MAC address is aged out. Ensures that the connection between a host and the gateway remains active when the host is idle. Notifies other devices of a master/backup switchover in a VRRP group.

The MAC address table of a switch stores mappings between the destination MAC addresses of frames ai ports. True. False.

If the destination MAC address of a data frame received by a server interface does not match the MAC address of the server interface, the server discarcls the data frame. True. False.

The ARP protocol obtains the MAC address of the destination device based on the destination IP address, thus implementing eachability at the data link layer. True. False.

lf the value of the Type field in an Ethemet Il frame is 0x0806, the corresponding upperlayer protocol type is (): IPv4. RARP. ARP. IPv6.

During TCP connection termination, Host A sends a FIN-ACK segment with the sequence number a and the acknowledgment number b, known as (FIN,ACK(seq=a,ack=b)), to Server B. Server B replies with a segment containing an ACK flag as an acknowledgement of the FIN packet from Host A. Which of the following statements about the ACK segment is true?. ACkK(seg=b+1,ack=a+1). ACK(seg=a+1,ack=b). ACK(seg=b,ack=a+1). ACK(seg=b,ack=a).

Which of the following statements about Layer 3 switches is false?. A Layer 3 switch can implement inter-VLAN communication using VLANIF technology. A Layer 3 switch can have routing entries. A Layer 3 switch can have ARP entries. To enable communication between two VLANS, a switch only needs to be configured with one VLANIF interface.

TCP is located at the transport layer of the TCP/IP model. It is a connection oriented end-to-end protocol. A TCP data segment consists of a TCP header and a TCP data section. Which of the following fields are included in the TCP header?. Source IP address. Source port number. Destination IP address. Destination port number. Window size.

The configuration files and VRP system files of Huawei network devices are stored in physical storage media. Network engineers can efficiently manage the device configuration files and VRP system files only after they have a good grasp of the basic operations on the file system. Which of the following statements about VRP commands and functions is false?. The cat command is used to view the detailed contents of a text file. The dir command displays information about files in the current directory. The move command is used to move a file. The delete command is used to delete a file.

The VRP system can use FTP and TFTP to upload and download files. True. False.

When a switch performs the flooding operation, it forwards a frame out through all ports except the one through which the frame was received. True. False.

Routing preference is an indicator used by a router to compare routes of different routing protocols. Which of the following statements about routing protocol preference is false?. Static routes have the highest priority. The default preference of OSPF routes is 10. The default preference of RIP routes is 120. Ona Huawei device, the preference of a static route ranges from 1 to 255.

lf a router fails to find a specific route matching the destination address of a data packet and no default route is available, the router discards the packet. True. False.

As shown in the following figure, all switches run STP, so the root bridge is ( ): SW1. SW2. SW3. SW4.

In STP, all ports on a root bridge are root ports. True. False.

Which of the following statements about STP port states are true?. Only the root port and designated port of a device can enter the forwarding state. Ports in the listening state can forward both BPDUs and user traffic. Ports in the disabled state do not process or forward BPDUSs. They also do not forward user traffic. An alternate port will be blocked.

Which of the following parameters affect STP root port election?. Path cost from the port to the root bridge. Port priority. Port ID. MAC address of the port. Duplex mode of the port.

Which of the following statements about the STP process is true?. A root bridge is elected. A root port is elected for each non-root switch. A designated port is elected for each network segment, and non-root and non-designated ports are blocked. A root bridge is elected. A designated port is elected for each non-root switch. A root port is elected for each network segment, and non-root and non-designated ports are blocked. Aroot bridge is elected. A root port is elected for each non-root switch. A designated port is elected for each network segment, and non-designated ports are blocked. A root bridge is elected. A root port is elected for each non-root switch. A designated port is elected for each network segment, and non-root ports are blocked.

In STP mode, after a non-root switch receives a BPDU with the TC bit set to 1 from the root switch, which of the following ports will the non-root switch use to forward the BPDU out?. Root port. Backup port. Designated port. Alternate port.

Which of the following statements is false about optimal route selection on a router?. If a static route and an OSPF route to the same destination network have the same preference, the router can determine the optimal route by comparing their metric values. If the router learns multiple routes to the same destination network through different routing protocols, the router selects the route with the highest preference as the optimal route. If the router learns multiple routes to the same destination network through the same routing protocol, the router determines the route(s) to be added to the routing table based on the metric values of these routes. When the router performs a lookup in its routing table, it selects routing entries for packet forwarding based on the longest match rule.

A greater preference value of a routing protocol indicates a higher preference. True. False.

Equal-cost routes are routes to the same destination network that have the same mask, preference, and metric. True. False.

Which of the following are not possible results of a routing loop?. Packets will be transmitted endlessly. The CPU usage of the router increases. The destination IP addresses of data packets are frequently changed. Data packets will keep growing in size.

Refer to the following display ip routing-table command output on a router. Which of the following statements are true?. There are two equal-cost routes from the router to the 10.1.26.0/24 network segment. 10.1.121.0/24 and 10.1.122.0/24 are two network segments directly connected to the router. The Proto field indicates the routing protocol that learns the route. The first static route will become a backup route to the network segment 10.1.26.0/24 if its preference value is changed to 10.

A router has the following routing table: The default route is learned from the ASBR. There are two equal-cost routes to network segment 10.0.13.0/24. Packets with destination IP address 10.0.1.24 match the default route and are forwarded out by the router. The two static routes can be summarized into one summary route destined for 10.0.14.0/22.

Each interface of a router is in an independent broadcast domain. True. False.

The address segment FFO2::1 indicates all routers within the link-local scope. True. False.

Which of the following must be specified when configuring a static route on an Ethernet network?. Destination network segment. Next-hop IP address. Mask for the destination network segment. Next-hop MAC address.

Which of the following is the default preference of static routes on Huawei devices?. 0. 1. 60. 100.

The next-hop IP address must be specified during static route configuration. True. False.

The following figure shows the IP addresses of the interfaces connecting routers R1, R2, and R3. A static route is configured on R1 using the command ip route-static 10.0.23.0/24 10.0.13.3, so that the IP address 10.0.23.3 of GE0/0/2 on R3 can be pinged from R1. To prevent the communication failure between R1 and R3 in the event of the link between them becoming faulty, a backup link to 10.0.23.3 needs to be configured. Which of the following commands should be used to configure the backup link?. [R1]ip route-static 10.0.23.0 24 10.0.12.2 preference 40. [R1] ip route-static 10.0.23.0 24 10.0.12.2 preference 80. [R1]ip route-static 10.0.23.0 24 10.0.12.2 preference 40 [R3] ip route-static 10.0.12.0 24 10.0.23.2. [R1] ip route-static 10.0.23.0 24 10.0.12.2 preference 80 [R3] ip route-static 10.0.12.0 24 10.0.23.2.

As shown in the following figure, the interfaces interconnecting R1, R2, R3, and R4 run OSPF and all belong to area O. With these configurations, which of the following statements is false?. There are two egual-cost routes from the router R1 to the 10.0.23.0/24 network segment. The forwarding path for the ping packets from R1 to 10.0.34.4 is R1 -> R3 -> R4. There are two equal-cost routes from the router R1 to the 10.0.34.0/24 network segment. If the link between routers R1 and R3 is faulty, routers R1 and R4 can still communicate with each other.

Which of the following network types are defined in OSPF? (). Broadcast network. Point-to-point network. Non-broadcast multiple access network. Point-to-multipoint network.

Routers R1 and R2 are connected over an Ethernet, and their connecting interfaces run OSPF. The router ID of the OSPF process on R1 is 1.1.1.1, and that on R2 is 2.2.2.2. With these configurations, which of the following statements is false?. R1 is the DR, and R2 is the BDR. The DR priorities of the two devices are both 1 by default. The ospf dr-priority command can be used to set a priority for an interface that participates in the DR election. Changing the DR priority of the BDR to be higher than that of the DR will not trigger a DR election.

OSPF defines two types of multi-access networks: Non-Broadcast Multiple Access network and Point-toMultipoint network. True. False.

Assume that OSPF is enabled on a router and the IP address of interface GEO/0/1 is 10.1.1.1/24. To enable OSPF on this interface, which of the following commands can be run in the OSPF area view?. network 10.1.1.0 0.0.0.255. network 10.1.1.0 255.255.255.0. network 10.1.1.1 0.0.0.0. network 10.1.1.1 255.255.255.255.

Which of the following statements about DR/BDR election in OSPF are false?. A router whose OSPF interface priority is 0 will not participate in DR or BDR election. A router with a smaller OSPF interface priority value has the higher priority. If multiple routers have the same OSPF interface priority values, the router with the largest router ID is elected as the DR. If the current DR fails, the router with the highest interface priority among the remaining routers becomes the new DR.

OSPFv3 is the OSPF version that supports IPv6. Which of the following statements about OSPF is false?. OSPFv3 uses the multicast address ff02::5. OSPFv3 and OSPFv2 are incompatible. The establishment of an OSPFv3 neighbor relationship does not require the configuration of an IPv6 global unicast address on each router. Only a link-local address needs to be configured on each router. OSPFv3 provides the authentication function.

Which of the following statements is true about the interval for sending OSPF Hello packets and the dead time for an OSPF neighbor relationship?. The intervals at which OSPF neighbors send Hello packets to each other must be the same, but the dead time for the OSPF neighbor relationship can be different. The intervals at which OSPF neighbors send Hello packets to each other can be different, but the dead time for the OSPF neighbor relationship must be the same. The intervals at which OSPF neighbors send Hello packets to each other must be the same, and the dead time for the OSPF neighbor relationship must also be the same. The intervals at which OSPF neighbors send Hello packets to each other can be different, and the dead time for the OSPF neighbor relationship can also be different.

OSPF defines two types of multi-access networks: Non-Broadcast Multiple Access network and Point-toMultipoint network. True. False.

If no OSPFv3 router ID is configured, the system selects a router ID using rules similar to those used in OSPFv2. True. False.

Ona broadcast network, 10 routers are interconnected using OSPF. How many adjacencies will be established between them?. 45. 17. 28. 16.

As shown in the following figure, OSPF runs on the interfaces connecting R1, R2, and R3. The bandwidth reference values on the three routers are all set to 1000 Mbit/s. With these configurations, what is the cost of the OSPF route learned by R3?. 2. 11. 10. 3.

DHCP can be used to dynamically allocate network parameters, such as IP addresses, so as to reduce the workload of network administrators and avoid potential address conflicts caused by manual network parameter configuration. Which of the following statements about DHCP is true?. The DHCP Discover packet must be a broadcast packet. The DHCP Offer packet must be a unicast packet. The DHCP Request packet must be a unicast packet. The DHCP ACK packet may be a unicast packet.

Assume that the DHCP function is configured on a device, and the display ip pool command generates the following output. Which of the following statements is false?. The global DHCP address pool has been configured on the device. The gateway IP address of the client is 10.1.1.1. An IP address has been allocated. Clients obtain IP addresses from the address segment 10.1.1.0/24.

FTP is a protocol for transferring files. Which of the following statements about FTP are true?. When FTP is used to transmit data, two connections are established between the server and client. FTP sends images in ASCIl mode. By default, FTP transfer mode is ASCII. The FTP server uses TCP port 21 to set up a control connection with the client.

As shown in the following figure, GE1/0/1 and GE1/0/2 of CE1 are access interfaces that belong to VLAN 10 and VLAN 20, respectively. The IP addresses of GE0/0/1 on R1 and R2 are 10.0.12.1/24 and 10.0.11.1/24, respectively. To enable communication between R1 and R2 using VLANIF technology, which of the following sets of commands should be run?. [CE1]: interface vlanif 10 ip address 10.0.12.254 24 interface vlanif 20 ip address 10.0.11.254 24. [CE1] interface vlanif 10 ip address 10.0.12.254 24 interface vlanif 20 ip address 10.0.11.254 24 [R1]: ip route-static 10.0.11.0 24 10.0.12.254 [R2]: ip route-static 10.0.12.0 24 10.0.11.254. [CE1]: interface vlanif 10 ip address 10.0.12.254 24 [R1]: ip route-static 10.0.11.0 24 10.0.12.254. [CE1]: interface vlanif 20 ip address 10.0.11.254 24 [R2]: ip route-static 10.0.12.0 24 10.0.11.254.