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2021 Nov 400-101 ccie written passing score:

Q11. DRAG DROP 

Drag and drop the QoS requirement on the left to the correct QoS technology on the right. 

Answer: 


Q12. Refer to the exhibit. 

Which additional configuration is necessary for R1 and R2 to become OSPF neighbors? 

A. R1 

! 

router ospf 1 

no passive-interface Fastethernet0/0 

! 

B. R2 

! 

router ospf 10 

no network 10.1.1.6 0.0.0.0 area 0 

network 10.1.1.6 0.0.0.0 area 1 

! 

C. R1 

! 

interface FastEthernet0/0 

ip ospf mtu-ignore 

! 

R2 

! 

interface FastEthernet0/1 

ip ospf mtu-ignore ! 

D. R1 

! 

no router ospf 1 

router ospf 10 

network 10.1.1.5 0.0.0.0 area 0 

Answer: A 

Explanation: 

Because the passive interface default command is used, by default all interfaces are passive and no neighbors will form on these interfaces. We need to disable passive interface on the link to R2 by using the “no passive-interface Fastethernet0/0” on R1 under OSPF. 


Q13. Refer to the exhibit. 

You have configured two routing protocols across this point-to-point link. How many BFD sessions will be established across this link? 

A. three per interface 

B. one per multicast address 

C. one per routing protocol 

D. one per interface 

Answer: D 

Explanation: 

Cisco devices will use one Bidirectional Forwarding Detection (BFD) session for multiple client protocols in the Cisco implementation of BFD for Cisco IOS Releases 12.2(18)SXE, 12.0(31)S, and 12.4(4)T. For example, if a network is running OSPF and EIGRP across the same link to the same peer, only one BFD session will be established, and BFD will share session information with both routing protocols. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/fs_bfd.html#wp1053749 


Q14. Which value is the maximum segment size if you start with an MTU of 1500 bytes and then remove the overhead of the Ethernet header, IP header, TCP header, and the MAC frame check sequence? 

A. 1434 bytes 

B. 1460 bytes 

C. 1458 bytes 

D. 1464 bytes 

Answer: B 


Q15. Refer to the exhibit. 

Which prefixes will appear in the EIGRP topology table? 

A. 10.0.0.0/8, 172.16.1.0/24, 192.168.0.0/16 

B. 10.1.1.0/24, 10.1.2.0/24, 172.16.1.0/26, 192.168.1.0/26, 192.168.2.0/26 

C. 10.1.1.0/24, 10.1.2.0/24, 172.16.1.0/26, 172.16.2.0/26, 192.168.1.0/26, 192.168.2.0/26 

D. 10.1.1.1/24, 10.1.2.1/24, 172.16.1.1/26, 172, 192.168.1.1/26, 192.168.2.1/26 

Answer: B 


Most up-to-date ccie written dumps 400-101:

Q16. Refer to the exhibit. 

Why is network 172.16.1.0/24 not installed in the routing table? 

A. There is no ARP entry for 192.168.1.1. 

B. The router cannot ping 192.168.1.1. 

C. The neighbor 192.168.1.1 just timed out and BGP will flush this prefix the next time that the BGP scanner runs. 

D. There is no route for 192.168.1.1 in the routing table. 

Answer: D 

Explanation: 

Here we see that the next hop IP address to reach the 172.16.1.0 network advertised by the BGP peer is 192.168.1.1. However, the 192.168.1.1 IP is not in the routing table of R3 so it adds the route to the BGP table but marks it as inaccessible, as shown. 


Q17. DRAG DROP 

Drag and drop the BGP attribute on the left to the correct category on the right. 

Answer: 


Q18. Which statement about the VLAN database is true? 

A. Manually deleting the vlan.dat file can cause inconsistency in the database. 

B. Private VLAN information is stored in the database. 

C. VLAN configurations 1 through 4096 are stored in the vlan.dat file. 

D. The VLAN database is used only if the VTP domain name in the VLAN database matches the VTP domain name in the startup-config file. 

Answer: A 


Q19. Refer to the exhibit. 

If EIGRP is configured between two routers as shown in this output, which statement about their EIGRP relationship is true? 

A. The routers will establish an EIGRP relationship successfully. 

B. The routers are using different authentication key-strings. 

C. The reliability metric is enabled. 

D. The delay metric is disabled. 

Answer: C 

Explanation: 

The 5 K values used in EIGRP are: 

K1 = Bandwidth modifier 

K2 = Load modifier 

K3 = Delay modifier 

K4 = Reliability modifier 

K5 = Additional Reliability modifier 

However, by default, only K1 and K3 are used (bandwidth and delay). In this output we see that K1, K3, and K4 (Reliability) are all set. 


Q20. Which two features are used for inspection when IPv6 address glean is enabled? (Choose two.) 

A. DHCP messages 

B. ND messages 

C. ICMPv6 messages 

D. UDP messages 

E. TCP messages 

Answer: A,B 

Explanation: 

IPv6 address glean is the foundation for many other IPv6 features that depend on an accurate binding table. It inspects ND and DHCP messages on a link to glean addresses, and then populates the binding table with these addresses. This feature also enforces address ownership and limits the number of addresses any given node is allowed to claim. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6_fhsec/configuration/15-s/ip6f-15-s-book/ip6-snooping.html