Cisco 400-101 CCIE Routing and Switching Written Exam Online Training
Cisco 400-101 Online Training
The questions for 400-101 were last updated at Sep 15,2025.
- Exam Code: 400-101
- Exam Name: CCIE Routing and Switching Written Exam
- Certification Provider: Cisco
- Latest update: Sep 15,2025
What are two reasons for an OSPF neighbor relationship to be stuck in exstart/exchange state? (Choose two.)
- A . There is an MTU mismatch.
- B . There is an area ID mismatch.
- C . Both routers have the same OSPF process ID.
- D . Both routers have the same router ID.
- E . There is an authentication mismatch.
Refer to the exhibit.
What is the PHB class on this flow?
- A . none
- B . CS4
- C . EF
- D . AF21
Refer to the exhibit.
Which statement is true about a valid IPv6 address that can be configured on interface tunnel0?
- A . There is not enough information to calculate the IPv6 address.
- B . 6to4 tunneling allows you to use any IPv6 address.
- C . 2001. 7DCB. 5901::/128 is a valid IPv6 address.
- D . 2002. 7DCB. 5901::/128 is a valid IPv6 address.
Which three statements are true about PPP CHAP authentication? (Choose three)
- A . PPP encapsulation must be enabled globally.
- B . The LCP phase must be complete and in closed state.
- C . The hostname used by a router for CHAP authentication cannot be changed.
- D . PPP encapsulation must be enabled on the interface.
- E . The LCP phase must be complete and in open state.
- F . By default, the router uses its hostname to identify itself to the peer.
Which two statements about route redistribution default metrics are true? (Choose two)
- A . When EIGRP is redistributed into OSPF as E2, it has a default metric of 20.
- B . When an IGP is redistributed into RIP, it has a default metric of 1.
- C . When an IGP is redistributed into OSPF, it has a default metric of 110.
- D . When an IGP is redistributed into IS-IS, it has a default metric of 115.
- E . When an BGP is redistributed into OSPF, it has a default metric of 1.
Which two features of DMVPN are true? (Choose two)
- A . It supports multicast traffic
- B . It requires IPsec encryption
- C . It only supports remote peers with statically assigned addresses
- D . It offers configuration reduction
- E . It does not support spoke routers behind dynamic NAT
Refer to exhibit.
Which EIGRP routes will appear in the routing table of R2?
- A . 2001:112::/64, 2001:12::1/128
- B . 2001:12::1/64
- C . 2001:112::/64, 2001:12::1/64
- D . 2001:12::1/128
Which three pieces of information are carried on OSPF type 3 LSAs? (Choose three)
- A . metric
- B . authentication type
- C . forwarding address
- D . IP subnet
- E . external route tag
- F . subnet mask
Which statement about Cisco Express Forwarding is true?
- A . The FIB table resides on the route processor and the adjacency table resides on the line cards when
- B . Cisco Express Forwarding is enabled
- C . The FIB table and the adjacency table reside on the line cards when Cisco Express Forwarding is enabled
- D . Layer 2 next-hop address information is maintained in the adjacency table
- E . Layer 2 next-hop address information is maintained in the FIB table
Refer to the exhibit.
Which two statements about the output are true? (Choose two.)
- A . Setting the priority of this switch to 0 for VLAN 1would cause it to become the new root.
- B . This switch is the root bridge for VLAN1.
- C . Spanning-tree PortFast should not be enabled on GigabitEthernet2/1.
- D . 802.1w spanning tree is being used.
- E . Spanning tree PortFast is enabled on GigabitEthernet1/1.
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