Deck 17: HCIA-SDN

Question 1

On an SDN network, network devices only need to be responsible for data forwarding.

Answer 1

True

Question 2

In the SDN RR+ solution, the AC can provide which of the following functions? (Choose all that apply.)

A) Calculates optimal paths globally based on multiple constraints.
B) Pre-defines BGP routing policies.
C) Generates BGP routes/policies and applies them to devices.
D) Manages topology and BGP relationships

Answer 2

Generates BGP routes/policies and applies them to devices.
Manages topology and BGP relationships

Question 3

A trunk port on a switch allows packets from VLANs 3, 4, and 5 to pass, but only packets from VLANs 3 and 4 have tags. Which of the following may be the reason why packets from VLAN 5 do not have tags?

A) The port PVID is 5.
B) The port PVID is 3 and 4.
C) During trunk port configuration, the port trunk permit vlan 3 4 command is configured.
D) GVRP is enabled on this port.

Answer 3

The port PVID is 3 and 4.

Question 4

On a VXLAN network, which of the following statements are NOT true about VNIs? (Choose all that apply.)

A) A VNI is a VXLAN network identifier used to differentiate VXLAN segments.
B) One VNI identifies one tenant, regardless of whether the tenant contains multiple end users.
C) VMs of different VXLAN segments cannot directly communicate with each other Layer 2.
D) A VNI consists of 16 bits.

Question 5

During SDN network fault locating, which of the following commands can be used to collect basic runtime information for datacom devices?

A) display version
B) display diagnostic-information
C) display log
D) display current-configuration

Question 6

In terms of the SDN architecture, the ONF does not recommend carriers to change the existing network architecture, but the IETF recommends carriers to do so.

Question 7

The OpenFlow protocol in SDN architecture is led and actively promoted by the IETF.

Question 8

When a host shifts from one network to another, which of the following statements is true?

A) You must change its IP address and MAC address.
B) You must change its IP address, but not its MAC address.
C) You must change its MAC address, but not its IP address.
D) The MAC address and IP address do not need to be changed.

Question 9

Regarding the VS technology of CE series switches on an SDN network, which of the following statements are true? (Choose all that apply.)

A) All ports on a forwarding chip of the LPU must be allocated to the VS in Group mode at the same time.
B) All ports on a forwarding chip of the LPU must be allocated to the VS in Port mode at the same time.
C) Any LPU ports can be freely assigned at any VS in Group mode.
D) Any LPU ports can be freely assigned at any VS in Port mode.

Question 10

Which OpenStack component is responsible for managing virtual networks and determining the ID of the server that the VM IP address, VM MAC address, and VM belong to?

A) Nova
B) Neutron
C) Cinder
D) NetMatrix

Question 11

Which of the following statements is true about proxy ARP?

A) Proxy ARP allows a gateway directly connected to the host to use its own MAC address to reply to ARP requests in place of the destination host.
B) Proxy ARP allows a gateway directly connected to the host to help the destination host to transmit ARP packets across VLANs.
C) Proxy ARP is used for communication within a VLAN.
D) Proxy ARP means to buy the permission to use ARP packets from a proxy.

Question 12

Which of the following is the port number used by VXLAN packets?

A) 4786
B) 4787
C) 4788
D) 4789

Question 13

Which of the following protocols is defined by the network layer of the OSI protocol suite?

A) ES-ES
B) RIP
C) OSPF
D) IS-IS

Question 14

Which of the following are true about SDN? (Choose all that apply.)

A) In the SDN architecture, the underlying switches need to provide only the most basic and simple functions.
B) SDN is applicable to cloud computing providers and enterprises facing substantially increasing workloads.
C) SDN's forwarding-control separation architecture standardizes and simplifies network devices.
D) SDN cannot implement flexible and centralized control and cloudfield application awareness.

Question 15

Currently, the packet forwarding efficiency of Layer 3 switches is greatly improved. Which of the following may be the cause?

A) By using higher-performance hardware
B) By using the "routing once and switching multiple times" forwarding technology
C) By using packet-to-packet forwarding technology
D) By dividing the VLAN to effectively suppress broadcast storms and save bandwidth and other system resources.

Question 16

In OSPF, which of the following statements is true within a given area (area A)?

A) The LSA generated by each router is the same.
B) The LSDB of area A of each router is the same.
C) The shortest path tree calculated based on the LSDB of each router is the same.
D) The route calculated based on each router's shortest path tree is the same.

Question 17

On a P2P IS-IS network, which of the following is true about the use of PSNP packets?

A) Confirm receipt of LSPs.
B) Discover neighbors.
C) Set up adjacencies.
D) Select the DIS.

Question 18

The CE-SPUs of the CE12800 on an SDN network employs which of the following redundancy methods?

A) 1:1
B) 2+1
C) 3+1
D) 5+1

Question 19

The SDN controller has a global view of the entire network.

Question 20

Which of the following descriptions are true about SDN? (Choose all that apply.)

A) SDN is OpenFlow.
B) SDN supports forwarding-control separation.
C) SDN provides programmable open interfaces.
D) SDN is short for software-defined networking.

Question 21

The OpenStack architecture comprises which of the following components? (Choose all that apply.)

A) Nova
B) Neutron
C) Cinder
D) NetMatrix

Question 22

In BGP, which of the following are methods for loop avoidance?

A) The Origin attribute of a route records the source from which the route was imported
B) In a route's AS-Path attribute, all ASs along the path are recorded.
C) In the next-hop attribute of a route, the route's next hop is recorded.
D) The MED attribute of a route affects the outbound interface selection of another AS.

Question 23

What kind of packet is used by BGP to transmit version number and AS number information?

A) Open
B) Update
C) Keepalive
D) Notification

Question 24

NetStream is implemented by NE software. When the traffic is heavy, device performance may be affected.

Question 25

SNMP uses connectionless UDP as the transmission protocol, whereas NETCONF uses connection-oriented TCP.

Question 26

Which of the following statements are true about OpenFlow interface information reporting? (Choose all that apply.)

A) After the OpenFlow channel is successfully established, the controller actively queries port information from FPs.
B) The controller sends Multipart Request messages to query port information.
C) FPs respond with a Multipart Reply message for batch delivery of port information.
D) When a port changes, the corresponding FP actively sends a Flow Mod message to report the port change information.

Question 27

In the SDN architecture, which of the following belong to the application layer? (Choose all that apply.)

A) OpenStack
B) Third-party APP platform
C) SNC
D) NetMatrix

Question 28

Which of the following statements are true about the DIS in IS-IS? (Choose all that apply.)

A) A DIS creates and updates pseudo nodes on a broadcast network.
B) DIS election is unpredictable.
C) When all IS priorities are the same within a LAN, the IS with the largest MAC address is elected as the DIS.
D) DIS election on a broadcast network is held in preemption mode.

Question 29

Which of the following statements are true about the meaning of the peer 20.1.1.2 allow-as-loop 2 command? (Choose all that apply.)

A) The local AS number can be repeated in the AS_Path attribute in the received routes.
B) 2 indicates the number of times the AS number can be repeated.
C) This command can only be used on EBGP peers.
D) By default, the number of times the AS number is allowed to be duplicated is 1.

Question 30

Which of the following statements about SNMP are not true? (Choose all that apply.)

A) SNMP is an application layer protocol that requires reliable TCP at the transport layer to provide services.
B) SNMP is used to manage information transmitted between the two points, making it easy for administrators to preform operations.
C) SNMP uses the client/server model.
D) There are three SNMP protocol versions. Currently, only SNMPv3 supports community name-based security mechanisms.

Question 31

Which of the following are parts of the SNMP network management model? (Choose all that apply.)

A) NMS
B) Agent
C) SOA
D) MIB

Question 32

Which OpenStack component is responsible for managing virtual networks and determining the ID of the server that the VM IP address.

A) Nova
B) Neutron
C) Cinder
D) NetMatrix

Question 33

For a router that runs BGP4, which of the following statements is not true?

A) When multiple paths exist, BGP4 selects the optimal path.
B) BGP notifies the routes obtained from EBGP to all its BGP peers.
C) BGP advertises to BGP peers only the routes it uses.
D) BGP4 notifies the routes obtained from IBGP to all its BGP peers.

Question 34

Which of the following statements about NetStream logs are true? (Choose all that apply.)

A) NetStream logs have V5, V8, and V9 formats. The difference between V5 and V9 is that V5 is fixed and does not support traffic aggregation, whereas V9 supports traffic aggregation and data format customization.
B) NetStream packets use UDP encapsulation and unlike SFlow, NetStream does not support traffic sampling.
C) A field within NetStream packets can distinguish whether traffic is inbound or outbound.
D) The start time of a NetStream flow is the time that elapses between January 1, 1970 at 00:00:00 to the moment the flow is created and expressed in seconds.

Question 35

Which of the following statements about NETCONF are true? (Choose all that apply.)

A) NETCONF provides a protection locking mechanism to prevent operations performed by multiple users from conflicting with each other.
B) NETCONF can query one or multiple records in a table and requires multiple interactions during this process.
C) NETCONF uses XML coding for system compatibility and extensibility.
D) NETCONF uses existing security protocols to ensure network security, and is not bound to any specific security protocols.

Question 36

Which statement about BGP is true?

A) BGP is used in ASs or between ASs to transmit and control routing information.
B) BGP is used in an AS to discover paths.
C) BGP is directly carried in IP packets.
D) BGP must establish peer relationships based on direct links.

Question 37

In the SDN architecture, which of the following protocols is used for communication between the control layer and application layer?

A) OpenFlow
B) NETCONF
C) RESTful
D) NetStream

Question 38

Which of the following statements are true about the comparison between OSPF and IS-IS? (Choose all that apply.)

A) OSPF runs on the IP layer, and IS-IS runs on the data link layer.
B) For IS-IS, a router belongs to multiple areas, but in OSPF, a router can belong to only one area.
C) DIS election in IS-IS is simple, preemptive, and can be predicted. DR election in OSPF is unpredictable and non-preemptive.
D) OSPF supports P2P/P2MP/NBMA/broadcast networks. IS-IS supports only P2P and broadcast networks.

Question 39

On an SDN network, OpenFlow connection backup data mainly includes which of the following? (Choose all that apply.)

A) Collected forwarder interface information
B) Binding relationship between the logical interface of the controller and the forwarder's physical interface
C) Connection management information of the forwarder
D) Collected forwarder VLAN information

Question 40

Which of the following statements are true about NetStream packet formats? (Choose all that apply.)

A) The V5 format does not support traffic aggregation, putting processing pressure on the NSC and NDA.
B) The V8 format supports traffic aggregation, but can output only aggregated IPv4 traffic data.
C) The V8 format is based on templates and can output both IPv4 and IPv6 traffic data.
D) The V9 format can output IPv4, IPv6 and MPLS traffic data.

Question 41

Which of the following statements is true about the IS-IS backbone area?

A) A router belongs to all areas.
B) All routers belong to the same area.
C) This area comprises a series of continuous L2 routers and L1-L2 routers.
D) This area is central area connected to other areas.

Question 42

Which of the following methods does not support traffic importing to the MPLS TE tunnel?

A) Static routing
B) Dynamic routing
C) Automatic routing
D) Policy-based routing

Question 43

SDN advocates overlay service cloudification and underlay hardware standardization.

Question 44

What kind of BGP packet contains routing information?

A) Open
B) Update
C) Keepalive
D) Notification

Question 45

Which of the following functions does ONOS have? (Choose all that apply.)

A) Reduces the service provider's CAPEX and OPEX
B) Enables network agility
C) Helps service providers migrate the existing network to dedicated devices
D) Provides a reliable, flexible, and high-performance SDN control plane

Question 46

OSPF and IS-IS are similar in many ways. The OSPF backbone area is indicated by area 0. Which of the following is used to indicate the IS-IS backbone area?

A) Area 0
B) Area 1
C) Area 49
D) No specific backbone area

Question 47

Which of the following statements about BGP are true? (Choose all that apply.)

A) BGP calculates and discovers the optimal route.
B) BGP uses TCP as the transport layer protocol with a port number of 170.
C) BGP stability is ensured by the high reliability of TCP, not by its own mechanism.
D) BGP sends only updated routing information, thereby saving a large amount of bandwidth resources.

Question 48

A trunk port on a switch allows packets from VLANs 3, 4, and 5 to pass, but only packets from VLANs 3 and 4 have tags. Which of the following may be the reason why packets from VLAN 5 do not have tags?

A) The port PVID is 5.
B) The port PVID is 3 and 4.
C) During port configuration, the port trunk permit vlan 3 4 command is configured.
D) GVRP is enabled on this port.

Question 49

Which statements about the link-state algorithm are true? (Choose all that apply.)

A) The link state is the description of a route.
B) The link state describes the network topology.
C) The link state algorithm does not generate route loops.
D) OSPF and RIP use the link state algorithm.

Question 50

The SFUs of the NE40E-X8A used on an SDN network employ which of the following redundancy methods?

A) 1:1
B) 1+1
C) 2+1
D) 3+1

Question 51

CE series switches on an SDN network cannot use service interfaces for stacking configuration.

Question 52

IN SNMP, managed devices use which of the following messages to actively send alarms to the NMS?

A) Trap
B) Inform
C) Get
D) Set

Question 53

Which of the following interfaces are provided by SDN reflect programmability? (Choose all that apply.)

A) Northbound interface
B) Southbound interface
C) Eastbound-westbound interface
D) API PLC programming interface