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2021 Oct ccie written exam:

Q401. Refer to the exhibit. 

How many EIGRP routes will appear in the routing table of R2? 

A. 0 

B. 1 

C. 2 

D. 3 

Answer: A 


EIGRPv6 on R2 was shut down so there is no EIGRP routes on the routing table of R2. If we turn on EIGRPv6 on R2 (with “no shutdown” command) then we would see the prefix of the loopback interface of R1 in the routing table of R2. 

Note. EIGRPv6 requires the “ipv6 unicast-routing” global command to be turned on first or it will not work. 

Q402. Refer to the exhibit. 

The VLAN-to-MST mapping is shown. (Assume SW1 acts as root for all possible MST instances.) 

spanning-tree mst configuration name MST 

revision 2 

instance 0 vlan 1-200,301-4094 instance 1 vlan 201-300 

If this topology is deployed, which action is required for traffic to flow on VLAN 200 and 300? 

A. Map VLAN 300 to instance 0. 

B. Map VLAN 200 to instance 2. 

C. Move instance 0 root to SW2. 

D. Move instance 1 root to SW2. 

E. Map both VLANs to instance 2. 

Answer: B 


Drag and drop the NHRP flag on the left to the corresponding meaning on the right. 


Q404. Refer to the exhibit. 

Which device role could have generated this debug output? 

A. an NHS only 

B. an NHC only 

C. an NHS or an NHC 

D. a DMVPN hub router 

Answer: B 


NHRP works off a server/client relationship, where the NHRP clients (let’s call them next hop clients/NHCs) register with their next hop server (NHS), it’s the responsibility of the NHS to track all of its NHCs this is done with registration request and reply packets. Here we see a registration request, which can only be sent by an NHC. 

Q405. Which two statements are true about an EVPL? (Choose two.) 

A. It has a high degree of transparency. 

B. It does not allow for service multiplexing. 

C. The EVPL service is also referred to as E-line. 

D. It is a point-to-point Ethernet connection between a pair of UNIs. 

Answer: C,D 


Following the MEF approach, the services that comprise the Metro Ethernet (ME) solution can be classified into the following two general categories: 

. Point-to-point (PtP) — A single point-to-point Ethernet circuit provisioned between two User Network Interfaces (UNIs). 

. Multipoint-to-multipoint (MPtMP) — A single multipoint-to-multipoint Ethernet circuit provisioned between two or more UNIs. When there are only two UNIs in the circuit, more UNIs can be added to the same Ethernet virtual connection if required, which distinguishes this from the point-to-point type. In the MEF terminology, this maps to the following Ethernet service types: 

. Ethernet Line Service Type (E-Line) — Point-to-point Ethernet service 

. Ethernet LAN Service Type (E-LAN) — Multipoint-to-multipoint Ethernet service 

Reference: lusters/HA_ME3_6.pdf 

400-101  free practice questions

Regenerate 400-101 ccie written passing score:

Q406. What is the new designation for the MPLS EXP (experimental) bits? 

A. QoS bits 

B. traffic class bits 

C. flow bits 

D. precedence bits 

Answer: B 


To avoid misunderstanding about how this field may be used, it has become increasingly necessary to rename this field. This document changes the name of the EXP field to the "Traffic Class field" ("TC field"). In doing so, it also updates documents that define the current use of the EXP field. 


Q407. By default, how does a GET VPN group member router handle traffic when it is unable to register to a key server? 

A. All traffic is queued until registration is successful or the queue is full. 

B. All traffic is forwarded through the router unencrypted. 

C. All traffic is forwarded through the router encrypted. 

D. All traffic through the router is dropped. 

Answer: B 


In the basic GETVPN configuration, the traffic passing through group members will be sent in clear until it registers with the Key Server. This is because the crypto ACL is configured on the KS and GM will get that information only after the registration is successful. This means for a short period of time the traffic can go out unencrypted after a GM is booted up or the existing GETVPN session is cleared manually. This mode is called “fail open” and it is the default behavior. This behavior can be turned off by configuring “Fail Close” mode on the GMs. 


Q408. Refer to the exhibit. 

Which three statements about this configuration are true? (Choose three.) 

A. The default route appears in the global routing table. 

B. The static route appears in the VRF red routing table. 

C. The subnet is unique to the VRF red routing table. 

D. The static route is added to the global routing table and leaked from the VRF red. 

E. The subnet is unique to the global routing table. 

F. is reachable using any of the addresses on the router where the static route is configured. 

Answer: A,B,E 


This is an example of the route leaking feature. Here, this static route is created for the red VRF so it will be installed into the red VRF routing table, but the use of the global keyword will cause this default route to appear in the global routing table. 

Q409. Which mechanism can be used on Layer 2 switches so that only multicast packets with downstream receivers are sent on the multicast router-connected ports? 

A. IGMP snooping 

B. Router Guard 

C. PIM snooping 

D. multicast filtering 

Answer: C 


Ideally, the Layer 2 device should forward the multicast transmission only out ports to which receivers are connected and also out any ports that are connected to downstream multicast routers. This configuration requires a Layer 2 device to be able to determine the ports on which multicast routers and receivers for each separate (S,G) or (*,G) multicast group are located. To facilitate intelligent forwarding of multicast traffic on the LAN, Cisco Catalyst switches support two mechanisms: 

. IGMP snooping — The switch listens in or "snoops" IGMP communications between receivers and multicast routers. This snooping enables the switch to determine which ports are connected to receivers for each multicast group and which ports are connected to multicast routers. 

. Cisco Group Management Protocol (CGMP) — The switch communicates with multicasts routers, with multicast routers relaying group membership information to switches. 


Q410. 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