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2016 Dec ccie written exam:

Q61. Refer to the exhibit. 

What does the return code 3 represent in this output? 

A. The mapping of the replying router for the FEC is different. 

B. The packet is label-switched at stack depth. 

C. The return code is reserved. 

D. The upstream index is unknown. 

E. The replying router was the proper egress for the FEC. 



Return Codes The Return Code is set to zero by the sender. The receiver can set it to one of the values listed below. The notation <RSC> refers to the Return Subcode. This field is filled in with the stack-depth for those codes that specify that. For all other codes, the Return Subcode MUST be set to zero. 

Value Meaning 

0 No return code 

1 Malformed echo request received 

2 One or more of the TLVs was not understood 

3 Replying router is an egress for the FEC at stack-depth <RSC> 

4 Replying router has no mapping for the FEC at stack-depth <RSC> 


Q62. How many address families can a single OSPFv3 instance support? 

A. 1 

B. 2 

C. 5 

D. 10 


Q63. Refer to the exhibit. 

Which two actions can you take to enable CE-1 at site A to access the Internet? (Choose two.) 

A. Create a default route for site A on PE-1 with the next hop set to the PE-2 interface to the Internet. 

B. Originate a default route in site B with the next hop set to the PE-2 Internet interface, and import the default route into site A. 

C. Create a default route on CE-1 with the next hop set to the PE-1 upstream interface. 

D. Originate a default route in site A with the next hop set to the PE-2 interface to CE-1. 

E. Create a static default route on CE-1 with the next hop set to the PE-2 interface to the Internet. 

Answer: A,B 

Q64. Which statement about the BGP scope of the cost community is true? 

A. It is shared with IBGP neighbors only. 

B. It is shared with IBGP neighbors and route reflectors. 

C. It is shared with EBGP neighbors only. 

D. It is shared with IBGP and EBGP neighbors. 

E. It is shared with IBGP and confederation peers. 



The BGP Cost Community feature introduces the cost extended community attribute. The cost community is a non-transitive extended community attribute that is passed to internal BGP (iBGP) and confederation peers but not to external BGP (eBGP) peers. The cost community feature allows you to customize the local route preference and influence the best path selection process by assigning cost values to specific routes. 


Q65. Which two statements about static NAT are true? (Choose two.) 

A. An outside local address maps to the same outside global IP address. 

B. An inside local address maps to a different inside global IP address. 

C. An outside local address maps to a different outside global IP address. 

D. An inside local address maps to the same inside global IP address. 

Answer: A,D 


Example found at the reference link below: Reference: 

Rebirth ccie written dumps 400-101:

Q66. Which three statements about EVCs are true? (Choose three.) 

A. Spanning Tree must use MST mode on EVC ports. 

B. PAGP is supported on EVC ports. 

C. Spanning Tree must use RSTP mode on EVC ports. 

D. LACP is supported on EVC ports. 

E. Layer 2 multicast framing is supported. 

F. Bridge domain routing is required. 

Answer: A,B,D 


EVC support requires the following: 

–The spanning tree mode must be MST. 

–The dot1ad global configuration mode command must be configured. 

These Layer 2 port-based features can run with EVC configured on a port: 








Q67. Refer to the exhibit. 

R2 is mutually redistributing between EIGRP and BGP. 

Which configuration is necessary to enable R1 to see routes from R3? 

A. The R3 configuration must include ebgp-multihop to the neighbor statement for R2. 

B. The R2 BGP configuration must include bgp redistribute-internal. 

C. R1 must be configured with next-hop-self for the neighbor going to R2. 

D. The AS numbers configured on R1 and R2 must match. 



Whenever you redistribute from BGP to something else, BGP will only advertise externally learned routes. To allow the redistribution of iBGP routes into an interior gateway protocol such as EIGRP or OSPF, use the bgp redistribute-internal command in router configuration mode. 


Drag and drop the multicast protocol definition on the left to the correct default time interval on the right. 


Q69. Refer to the exhibit. 

Which LISP component do routers in the public IP network use to forward traffic between the two networks? 



C. map server 

D. map resolver 



Locator ID Separation Protocol (LISP) is a network architecture and protocol that implements the use of two namespaces instead of a single IP address: 

. Endpoint identifiers (EIDs)—assigned to end hosts. 

. Routing locators (RLOCs)—assigned to devices (primarily routers) that make up the global routing system. The public networks use the RLOC to forward traffic between networks. 


Q70. In an STP domain, which two statements are true for a nonroot switch, when it receives a configuration BPDU from the root bridge with the TC bit set? (Choose two.) 

A. It sets the MAC table aging time to max_age + forward_delay time. 

B. It sets the MAC table aging time to forward_delay time. 

C. It recalculates the STP topology upon receiving topology change notification from the root switch. 

D. It receives the topology change BPDU on both forwarding and blocking ports. 

Answer: B,D 


When the TC bit is received, every bridge is then notified and reduces the aging time to forward_delay (15 seconds by default) for a certain period of time (max_age + forward_delay). It is more beneficial to reduce the aging time instead of clearing the table because currently active hosts, that effectively transmit traffic, are not cleared from the table. Once the root is aware that there has been a topology change event in the network, it starts to send out its configuration BPDUs with the topology change (TC) bit set. These BPDUs are relayed by every bridge in the network with this bit set. As a result all bridges become aware of the topology change situation and it can reduce its aging time to forward_delay. Bridges receive topology change BPDUs on both forwarding and blocking ports. An important point to consider here is that a TCN does not start a STP recalculation. This fear comes from the fact that TCNs are often associated with unstable STP environments; TCNs are a consequence of this, not a cause. The TCN only has an impact on the aging time. It does not change the topology nor create a loop.