HCIP-Datacom-Core Technology V1.0 (H12-821) practice questions

Domain coverage 13 domains

• Routing Basics (3%)
• OSPF Core Knowledge (16%)
• IS-IS Core Knowledge (8%)
• BGP Core Knowledge (17%)
• Routing and Traffic Control (10%)
• Switching Core Knowledge (7%)
• Multicast Basics (9%)
• IPv6 Core Knowledge (3%)
• Network Security Basics (9%)
• Network Reliability Basics (8%)
• Network Service and Management (2%)
• Large-scale WLAN Architecture (6%)
• Network Solution (2%)

Sample questions 17 of 168 shown

1. Q1

   A company newly purchased a network device. As a network administrator, through what method is the device usually initially configured?

   1. FTP
   2. Telnet
   3. SNMP
   4. Console port login

   A newly purchased device has no IP address configured, so it cannot be reached remotely. The console port provides out-of-band, secure local access for first-time configuration. FTP, Telnet and SNMP all require existing IP connectivity.
2. Q2

   On the VRP platform, which of the following descriptions about the default priorities of various routing protocols is correct?

   1. The priority of OSPF routes is 15
   2. The priority of IS-IS routes is 0
   3. The priority of static routes is 60
   4. The priority of BGP routes is 20

   Huawei VRP default protocol priorities: Direct=0, OSPF=10, IS-IS=15, Static=60, RIP=100, OSPF ASE=150, BGP=255. Therefore only "static routes = 60" is correct.
3. Q3

   Which of the following statements about RIB and FIB is incorrect?

   1. The RIB directly guides packet forwarding
   2. The next hops in the RIB are all addresses of the peer's directly connected neighbor interfaces
   3. The FIB is generated from the RIB
   4. The RIB does not directly guide packet forwarding

   The RIB (IP routing table) selects the best route per destination and installs active routes into the FIB; the FIB (forwarding table) directly guides forwarding. Some RIB entries such as static and BGP routes may have a next hop that is not a directly connected neighbor interface (route recursion resolves it). So B is false. A is also false strictly, but the standard dump answer targets B; the RIB does not directly forward (the FIB does).
4. Q4

   What is the meaning of the letter "B" in the FLAG field of a Huawei forwarding table entry?

   1. Available route
   2. Static route
   3. Black hole route
   4. Gateway route

   Forwarding-table flag letters: G=Gateway, H=Host, U=Up, S=Static, D=Dynamic, B=Black Hole (next hop is the null interface), L=Vlink route. So B stands for Black Hole route.
5. Q5

   A socket is composed of a five-tuple. Which of the following does NOT belong to the five-tuple?

   1. Source IP
   2. Source MAC
   3. Destination IP
   4. Destination port

   The five-tuple is source IP, source port, destination IP, destination port, and transport-layer protocol. The source MAC address is a link-layer identifier and is not part of the five-tuple.
6. Q6

   Which of the following modules is unique to forwarding devices (compared with routers and switches)?

   1. Switching fabric board
   2. MPU
   3. LPU
   4. SPU

   The SPU (Service Processing Unit) provides value-added services such as firewall, NAT, IPSec and NetStream. The MPU is the main control board, LPU is the line processing (service) board, and the switching fabric is common to switches/routers.
7. Q7

   Which key component, together with Huawei NetEngine intelligent routers, builds the IP wide-area bearer network solution?

   1. iMaster NCE-Fabric
   2. iMaster NCE-IP
   3. iMaster NCE-Campus
   4. iMaster NCE-WAN

   iMaster NCE-WAN (WAN = Wide Area Network) is the controller component that works with NetEngine routers to build the IP wide-area bearer network solution.
8. Q8

   Which of the following does NOT belong to an IGP (Interior Gateway Protocol)?

   1. RIP
   2. IS-IS
   3. BGP
   4. OSPF

   IGPs include RIP, OSPF, IS-IS, etc. BGP is an Exterior Gateway Protocol (EGP family) used between autonomous systems.
9. Q9

   Which of the following descriptions about default routes of various protocols is incorrect?

   1. BGP can advertise default routes
   2. IS-IS can advertise default routes
   3. OSPF cannot advertise default routes
   4. Static default routes can be configured

   Both OSPF (default-route-advertise) and IS-IS (default-route-advertise) can advertise default routes into the domain, BGP can import default routes (default-route imported), and static default routes can always be configured. So C is false.
10. Q10

    Which of the following descriptions about BGP, OSPF and IS-IS is correct?

    1. A BGP neighbor relationship is established on top of a TCP session using port 179
    2. IS-IS runs on top of the IP protocol using protocol number 89
    3. BGP runs on top of a UDP session using port 179
    4. OSPF runs on top of a data-link-layer protocol

    BGP uses TCP port 179 for neighbor establishment. IS-IS is directly encapsulated at the data link layer (not IP/89; that is OSPF). OSPF runs on IP with protocol number 89.
11. Q11

    Which of the following descriptions about the forwarding plane of switching devices is incorrect?

    1. It implements packet encapsulation and decapsulation
    2. It is composed of the main control board and interface boards
    3. It provides high-speed non-blocking data channels
    4. It can implement packet statistics

    The forwarding (data) plane handles packet encapsulation/decapsulation, provides non-blocking channels and performs statistics. The main control board (MPU) belongs to the control plane, not the forwarding plane.
12. Q12

    Which of the following descriptions about the OSPF protocol is incorrect?

    1. The connection types described by a Router-LSA can be: P2P / TransNet / Virtual Link
    2. Routing information is only allowed between the backbone area and non-backbone areas; direct advertisement between non-backbone areas is not allowed
    3. Each OSPF router uses only one Router-LSA to describe the local active connection state of an area
    4. The Link State ID in a Type 3 LSA is the router-id of the ABR

    In a Type 3 (Network-Summary) LSA the Link State ID is the destination network address (not the ABR's router-id). Router-LSA (Type 1) connection types include P2P, TransNet, Stub and Virtual Link.
13. Q13

    Which of the following descriptions about OSPF multi-process is incorrect?

    1. Multiple different OSPF processes can run on the same router, independent and unaffected by each other
    2. One interface of a router can only belong to one OSPF process
    3. Route interaction between different OSPF processes is equivalent to route interaction between different routing protocols
    4. Different OSPF routers must have the same process number to establish neighbors

    The OSPF process number is locally significant only; neighbors are established based on area ID, hello/dead timers, authentication, etc., not the process number.
14. Q14

    Which of the following descriptions about the ASBR-Summary-LSA (Type 4) is incorrect?

    1. Metric indicates the OSPF cost for the ABR to reach the ASBR
    2. Advertising Router indicates the Router ID of the ABR
    3. Link State ID indicates the Router ID of the ASBR
    4. The Advertising Router field in Type 4 LSAs of all areas is the same

    A Type 4 LSA is generated by an ABR to describe an ASBR; its Link State ID is the ASBR's Router ID and Advertising Router is the generating ABR. When a Type 4 LSA crosses areas, the Advertising Router changes to the ABR of that area, so it is not the same in all areas.
15. Q15

    Which type of OSPF area can only reach other areas via a default route?

    1. Backbone area
    2. Totally Stub area
    3. NSSA
    4. Non-backbone area

    A Totally Stub area blocks Type 3, Type 4 and Type 5 LSAs; the ABR injects a single Type 3 default route, so traffic to other areas must use that default route.
16. Q16

    Which of the following descriptions about LSA3, LSA4 and LSA5 is correct?

    1. LSA5 does not change after traversing different areas, while LSA3 changes
    2. LSA3, LSA4 and LSA5 do not change after traversing different areas
    3. LSA3 does not change after traversing different areas, while LSA4 and LSA5 change
    4. LSA4 does not change after traversing different areas, while LSA3 and LSA5 change

    Type 3 and Type 4 LSAs are regenerated by each area's ABR (Advertising Router changes), whereas Type 5 LSAs are external and their Advertising Router (the ASBR) does not change when crossing areas.
17. Q17

    Which of the following descriptions about the output of display ospf peer is correct?

    1. During DD exchange negotiation, the local end becomes the Slave
    2. Address: 10.1.1.1 indicates the local interface address is 10.1.1.1
    3. Router ID indicates the local router ID is 10.1.1.1
    4. The Designated Router (DR) is the address 10.1.1.1

    In display ospf peer output, the "DR" field shows the DR's interface address on that network. If it shows 10.1.1.1, the DR for that segment is 10.1.1.1.

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