[H3CSE] H3C Senior Engineer Certification
Exam Preparation
Question 1. **In OSPF, which LSA type is generated by a router to describe its directly
connected networks?** A) Type 1 – Router LSA B) Type 2 – Network LSA C) Type 3 – Summary
LSA D) Type 5 – AS‑External LSA
Answer: A
Explanation: Type 1 Router LSAs are originated by every OSPF router and contain the router’s
links to its directly connected networks and other OSPF routers.
Question 2. **What is the primary purpose of a stub area in OSPF?** A) To allow external
routes from other ASes B) To reduce LSA flooding by not accepting Type‑5 LSAs C) To enable BGP
route redistribution D) To provide full inter‑area routing information
Answer: B
Explanation: Stub areas do not accept Type‑5 external LSAs, which reduces the amount of
routing information that must be processed inside the area.
Question 3. **Which OSPF feature allows two separate OSPF processes on the same router to
exchange routes?** A) Virtual links B) Route redistribution C) OSPF multi‑process D) Area
border router (ABR)
Answer: C
Explanation: OSPF multi‑process enables a router to run multiple OSPF instances and exchange
routes between them via redistribution.
Question 4. **In IS‑IS, what does the DIS election determine?** A) The router that will originate
L1 LSAs B) The router that will become the L2 backbone router C) The router that will act as the
Designated Intermediate System for a broadcast network D) The router that will perform route
leaking
Answer: C
Explanation: DIS (Designated Intermediate System) is elected on broadcast IS‑IS networks to
reduce adjacency formation traffic, similar to a Dijkstra’s OSPF DR.
, [H3CSE] H3C Senior Engineer Certification
Exam Preparation
Question 5. **Which NSAP address format is used for IP routing in IS‑IS?** A) IPv4 address B)
IPv6 address C) ISO 1‑address D) IPv4‑compatible IPv6 address
Answer: C
Explanation: IS‑IS uses the ISO NSAP (Network Service Access Point) address, typically an ISO
1‑address, to identify routers.
Question 6. **What is the effect of configuring a “totally stub‑area” in OSPF?** A) The area will
accept only intra‑area routes B) The area will accept summary routes but no external routes C)
The area will accept no Type‑3 or Type‑5 LSAs D) The area will accept only default routes from
the ABR
Answer: D
Explanation: A totally stub area discards all external (Type‑5) and summary (Type‑3) LSAs,
receiving only a default route from the ABR.
Question 7. **In BGP, which attribute is considered before the AS‑Path length when selecting
the best path?** A) MED B) Local Preference C) Origin D) Next‑Hop
Answer: B
Explanation: Local Preference is evaluated before AS‑Path length; a higher Local Preference is
preferred.
Question 8. **What does the BGP state “OpenSent” indicate?** A) The BGP session is
established B) The BGP speaker has sent an OPEN message C) The BGP speaker is waiting for a
KEEPALIVE D) The BGP speaker has received a NOTIFICATION
Answer: B
Explanation: “OpenSent” means the local BGP speaker has transmitted an OPEN message and is
awaiting a response.
Question 9. **Which BGP feature reduces the number of iBGP sessions required in a full‑mesh
topology?** A) Confederations B) Route reflectors C) Peer groups D) AS‑numbers
, [H3CSE] H3C Senior Engineer Certification
Exam Preparation
Answer: B
Explanation: Route reflectors allow a client‑server model, eliminating the need for a full mesh of
iBGP sessions.
Question 10. **When configuring IPv6 OSPFv3, which command enables the router to advertise
IPv6 routes?** A) ospf6 enable B) ipv6 router ospf C) ospfv3 enable D) ipv6 ospf process-id
Answer: B
Explanation: The command “ipv6 router ospf” creates an OSPFv3 process for IPv6 route
advertisement.
Question 11. **In IPv6, which ICMPv6 message is used for Duplicate Address Detection
(DAD)?** A) Neighbor Solicitation B) Router Advertisement C) Echo Request D) Parameter
Problem
Answer: A
Explanation: Neighbor Solicitation messages are sent to verify that an IPv6 address is not
already in use (DAD).
Question 12. **Which IPv6 transition mechanism encapsulates IPv6 packets inside IPv4 without
requiring explicit tunnels?** A) 6to4 B) ISATAP C) Dual‑stack D) Teredo
Answer: B
Explanation: ISATAP (Intra‑Site Automatic Tunnel Addressing Protocol) treats the IPv4 network
as a virtual link layer, encapsulating IPv6 packets in IPv4 automatically.
Question 13. **What is the purpose of a “private VLAN primary VLAN” in H3C switches?** A) To
provide routing between VLANs B) To act as a parent VLAN that contains isolated secondary
VLANs C) To enable VLAN trunking across the backbone D) To assign IP addresses to hosts
Answer: B
, [H3CSE] H3C Senior Engineer Certification
Exam Preparation
Explanation: A primary VLAN groups one or more secondary VLANs, which are isolated from
each other while sharing the same broadcast domain.
Question 14. **Which protocol dynamically registers VLANs across switches using GARP?** A)
VTP B) GVRP C) STP D) LLDP
Answer: B
Explanation: GVRP (GARP VLAN Registration Protocol) uses GARP messages to propagate VLAN
information automatically.
Question 15. **In MSTP, what is an MST instance?** A) A logical spanning‑tree per VLAN B) A
physical port grouping C) A set of VLANs mapped to a single spanning‑tree D) A backup root
bridge
Answer: C
Explanation: An MST instance maps a set of VLANs to a single spanning‑tree, allowing multiple
spanning‑tree domains within a network.
Question 16. **Which STP protection feature prevents a non‑root port from becoming root due
to BPDU injection?** A) Root guard B) BPDU guard C) Loop guard D) PortFast
Answer: A
Explanation: Root guard forces a port to remain in a blocking state if it receives superior BPDUs,
protecting the designated root bridge.
Question 17. **What timer does VRRP use to determine when a backup router should become
master?** A) Hello timer B) Skew time C) Master down interval D) Advertisement interval
Answer: D
Explanation: The VRRP advertisement interval defines how often the master sends
advertisements; if a backup does not receive an advertisement within Master Down Interval
(based on advertisement interval), it assumes master role.
Exam Preparation
Question 1. **In OSPF, which LSA type is generated by a router to describe its directly
connected networks?** A) Type 1 – Router LSA B) Type 2 – Network LSA C) Type 3 – Summary
LSA D) Type 5 – AS‑External LSA
Answer: A
Explanation: Type 1 Router LSAs are originated by every OSPF router and contain the router’s
links to its directly connected networks and other OSPF routers.
Question 2. **What is the primary purpose of a stub area in OSPF?** A) To allow external
routes from other ASes B) To reduce LSA flooding by not accepting Type‑5 LSAs C) To enable BGP
route redistribution D) To provide full inter‑area routing information
Answer: B
Explanation: Stub areas do not accept Type‑5 external LSAs, which reduces the amount of
routing information that must be processed inside the area.
Question 3. **Which OSPF feature allows two separate OSPF processes on the same router to
exchange routes?** A) Virtual links B) Route redistribution C) OSPF multi‑process D) Area
border router (ABR)
Answer: C
Explanation: OSPF multi‑process enables a router to run multiple OSPF instances and exchange
routes between them via redistribution.
Question 4. **In IS‑IS, what does the DIS election determine?** A) The router that will originate
L1 LSAs B) The router that will become the L2 backbone router C) The router that will act as the
Designated Intermediate System for a broadcast network D) The router that will perform route
leaking
Answer: C
Explanation: DIS (Designated Intermediate System) is elected on broadcast IS‑IS networks to
reduce adjacency formation traffic, similar to a Dijkstra’s OSPF DR.
, [H3CSE] H3C Senior Engineer Certification
Exam Preparation
Question 5. **Which NSAP address format is used for IP routing in IS‑IS?** A) IPv4 address B)
IPv6 address C) ISO 1‑address D) IPv4‑compatible IPv6 address
Answer: C
Explanation: IS‑IS uses the ISO NSAP (Network Service Access Point) address, typically an ISO
1‑address, to identify routers.
Question 6. **What is the effect of configuring a “totally stub‑area” in OSPF?** A) The area will
accept only intra‑area routes B) The area will accept summary routes but no external routes C)
The area will accept no Type‑3 or Type‑5 LSAs D) The area will accept only default routes from
the ABR
Answer: D
Explanation: A totally stub area discards all external (Type‑5) and summary (Type‑3) LSAs,
receiving only a default route from the ABR.
Question 7. **In BGP, which attribute is considered before the AS‑Path length when selecting
the best path?** A) MED B) Local Preference C) Origin D) Next‑Hop
Answer: B
Explanation: Local Preference is evaluated before AS‑Path length; a higher Local Preference is
preferred.
Question 8. **What does the BGP state “OpenSent” indicate?** A) The BGP session is
established B) The BGP speaker has sent an OPEN message C) The BGP speaker is waiting for a
KEEPALIVE D) The BGP speaker has received a NOTIFICATION
Answer: B
Explanation: “OpenSent” means the local BGP speaker has transmitted an OPEN message and is
awaiting a response.
Question 9. **Which BGP feature reduces the number of iBGP sessions required in a full‑mesh
topology?** A) Confederations B) Route reflectors C) Peer groups D) AS‑numbers
, [H3CSE] H3C Senior Engineer Certification
Exam Preparation
Answer: B
Explanation: Route reflectors allow a client‑server model, eliminating the need for a full mesh of
iBGP sessions.
Question 10. **When configuring IPv6 OSPFv3, which command enables the router to advertise
IPv6 routes?** A) ospf6 enable B) ipv6 router ospf C) ospfv3 enable D) ipv6 ospf process-id
Answer: B
Explanation: The command “ipv6 router ospf” creates an OSPFv3 process for IPv6 route
advertisement.
Question 11. **In IPv6, which ICMPv6 message is used for Duplicate Address Detection
(DAD)?** A) Neighbor Solicitation B) Router Advertisement C) Echo Request D) Parameter
Problem
Answer: A
Explanation: Neighbor Solicitation messages are sent to verify that an IPv6 address is not
already in use (DAD).
Question 12. **Which IPv6 transition mechanism encapsulates IPv6 packets inside IPv4 without
requiring explicit tunnels?** A) 6to4 B) ISATAP C) Dual‑stack D) Teredo
Answer: B
Explanation: ISATAP (Intra‑Site Automatic Tunnel Addressing Protocol) treats the IPv4 network
as a virtual link layer, encapsulating IPv6 packets in IPv4 automatically.
Question 13. **What is the purpose of a “private VLAN primary VLAN” in H3C switches?** A) To
provide routing between VLANs B) To act as a parent VLAN that contains isolated secondary
VLANs C) To enable VLAN trunking across the backbone D) To assign IP addresses to hosts
Answer: B
, [H3CSE] H3C Senior Engineer Certification
Exam Preparation
Explanation: A primary VLAN groups one or more secondary VLANs, which are isolated from
each other while sharing the same broadcast domain.
Question 14. **Which protocol dynamically registers VLANs across switches using GARP?** A)
VTP B) GVRP C) STP D) LLDP
Answer: B
Explanation: GVRP (GARP VLAN Registration Protocol) uses GARP messages to propagate VLAN
information automatically.
Question 15. **In MSTP, what is an MST instance?** A) A logical spanning‑tree per VLAN B) A
physical port grouping C) A set of VLANs mapped to a single spanning‑tree D) A backup root
bridge
Answer: C
Explanation: An MST instance maps a set of VLANs to a single spanning‑tree, allowing multiple
spanning‑tree domains within a network.
Question 16. **Which STP protection feature prevents a non‑root port from becoming root due
to BPDU injection?** A) Root guard B) BPDU guard C) Loop guard D) PortFast
Answer: A
Explanation: Root guard forces a port to remain in a blocking state if it receives superior BPDUs,
protecting the designated root bridge.
Question 17. **What timer does VRRP use to determine when a backup router should become
master?** A) Hello timer B) Skew time C) Master down interval D) Advertisement interval
Answer: D
Explanation: The VRRP advertisement interval defines how often the master sends
advertisements; if a backup does not receive an advertisement within Master Down Interval
(based on advertisement interval), it assumes master role.
