Cisco CCIE Examination Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
Question 1
Which BGP attribute is used first in path selection when comparing routes from
different eBGP neighbors?
A. MED
B. Local Preference
C. Weight
D. AS Path
Correct Answer: C
Rationale: Weight is the first Cisco-specific attribute evaluated in BGP path
selection and is locally significant to the router only. It overrides other attributes
when comparing multiple paths. Higher weight is preferred, making it the most
influential early decision factor in Cisco implementations.
Question 2
What is the primary purpose of OSPF LSA Type 1?
A. External route advertisement
B. Summary routes between areas
C. Router-specific link-state information
D. ASBR external redistribution
,Correct Answer: A
Rationale: OSPF Type 1 LSAs are Router LSAs that describe the state of links
within a single area. They are generated by every router and flooded only within
the same area. This forms the foundational topology database for SPF
calculations.
Question 3
Which MPLS label operation removes the top label from the stack?
A. Push
B. Swap
C. Pop
D. Rewrite
Correct Answer: B
Rationale: The swap operation replaces the top label with a new label as the
packet transits an MPLS network. It is used at label switching routers to forward
traffic toward the next hop. It does not remove the label stack entirely.
Question 4
Which protocol is used for dynamic discovery of Cisco neighbors?
A. OSPF
B. CDP
C. BGP
D. EIGRP
Correct Answer: D
Rationale: EIGRP uses Hello packets for neighbor discovery and adjacency
formation. It operates at Layer 3 and is more scalable than CDP for routing
relationships. It is Cisco-proprietary and optimized for fast convergence.
,Question 5
What does the command “ip cef” enable?
A. Process switching
B. Fast switching only
C. Cisco Express Forwarding
D. Routing table synchronization
Correct Answer: C
Rationale: Cisco Express Forwarding (CEF) is a high-performance packet
forwarding mechanism that uses a FIB and adjacency table. It reduces CPU load
and improves forwarding efficiency compared to process or fast switching.
Question 6
Which OSPF state comes immediately after INIT?
A. EXSTART
B. TWO-WAY
C. EXCHANGE
D. LOADING
Correct Answer: B
Rationale: After INIT, routers reach the TWO-WAY state when bidirectional
communication is established. In broadcast networks, DR/BDR election occurs
here. This state confirms neighbor recognition.
Question 7
Which BGP feature prevents routing loops within an AS?
, A. MED
B. Local Preference
C. AS Path
D. Next-Hop
Correct Answer: C
Rationale: The AS Path attribute lists all ASes a route has traversed. If a router
sees its own AS number in the path, it rejects the route, preventing loops across
autonomous systems.
Question 8
What is the default administrative distance of EIGRP internal routes?
A. 90
B. 100
C. 110
D. 120
Correct Answer: C
Rationale: OSPF routes have an administrative distance of 110 by default. This
value determines route preference when multiple routing protocols advertise the
same destination.
Question 9
Which IPv6 address type is equivalent to IPv4 broadcast?
A. Multicast
B. Anycast
C. Loopback
D. No broadcast exists
Correct Answer: A
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
Question 1
Which BGP attribute is used first in path selection when comparing routes from
different eBGP neighbors?
A. MED
B. Local Preference
C. Weight
D. AS Path
Correct Answer: C
Rationale: Weight is the first Cisco-specific attribute evaluated in BGP path
selection and is locally significant to the router only. It overrides other attributes
when comparing multiple paths. Higher weight is preferred, making it the most
influential early decision factor in Cisco implementations.
Question 2
What is the primary purpose of OSPF LSA Type 1?
A. External route advertisement
B. Summary routes between areas
C. Router-specific link-state information
D. ASBR external redistribution
,Correct Answer: A
Rationale: OSPF Type 1 LSAs are Router LSAs that describe the state of links
within a single area. They are generated by every router and flooded only within
the same area. This forms the foundational topology database for SPF
calculations.
Question 3
Which MPLS label operation removes the top label from the stack?
A. Push
B. Swap
C. Pop
D. Rewrite
Correct Answer: B
Rationale: The swap operation replaces the top label with a new label as the
packet transits an MPLS network. It is used at label switching routers to forward
traffic toward the next hop. It does not remove the label stack entirely.
Question 4
Which protocol is used for dynamic discovery of Cisco neighbors?
A. OSPF
B. CDP
C. BGP
D. EIGRP
Correct Answer: D
Rationale: EIGRP uses Hello packets for neighbor discovery and adjacency
formation. It operates at Layer 3 and is more scalable than CDP for routing
relationships. It is Cisco-proprietary and optimized for fast convergence.
,Question 5
What does the command “ip cef” enable?
A. Process switching
B. Fast switching only
C. Cisco Express Forwarding
D. Routing table synchronization
Correct Answer: C
Rationale: Cisco Express Forwarding (CEF) is a high-performance packet
forwarding mechanism that uses a FIB and adjacency table. It reduces CPU load
and improves forwarding efficiency compared to process or fast switching.
Question 6
Which OSPF state comes immediately after INIT?
A. EXSTART
B. TWO-WAY
C. EXCHANGE
D. LOADING
Correct Answer: B
Rationale: After INIT, routers reach the TWO-WAY state when bidirectional
communication is established. In broadcast networks, DR/BDR election occurs
here. This state confirms neighbor recognition.
Question 7
Which BGP feature prevents routing loops within an AS?
, A. MED
B. Local Preference
C. AS Path
D. Next-Hop
Correct Answer: C
Rationale: The AS Path attribute lists all ASes a route has traversed. If a router
sees its own AS number in the path, it rejects the route, preventing loops across
autonomous systems.
Question 8
What is the default administrative distance of EIGRP internal routes?
A. 90
B. 100
C. 110
D. 120
Correct Answer: C
Rationale: OSPF routes have an administrative distance of 110 by default. This
value determines route preference when multiple routing protocols advertise the
same destination.
Question 9
Which IPv6 address type is equivalent to IPv4 broadcast?
A. Multicast
B. Anycast
C. Loopback
D. No broadcast exists
Correct Answer: A
