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2021 Jan ccie written dumps 400-101:

Q1. DRAG DROP 

Drag and drop the MPLS term on the left to the function it performs on the right. 

Answer: 


Q2. Refer to the exhibit. 

Which statement is true? 

A. It is impossible for the destination interface to equal the source interface. 

B. NAT on a stick is performed on interface Et0/0. 

C. There is a potential routing loop. 

D. This output represents a UDP flow or a TCP flow. 

Answer: C 

Explanation: 

In this example we see that the source interface and destination interface are the same (Et0/0). Typically this is seen when there is a routing loop for the destination IP address. 


Q3. If two OSPF type 3 prefixes have the same metric, and are within the same process, which prefix(es) are installed into the routing table? 

A. The route whose originator has the lower router ID. 

B. Both routes are installed. 

C. The route whose originator has the higher router ID. 

D. The first route that is learned. 

Answer: B 

Explanation: 

OSPF allows multiple equal-cost paths to the same destination. Since all link-state information is flooded and used in the SPF calculation, multiple equal cost paths can be computed and used for routing, and each route will be installed in the routing table. 


Q4. Refer to the exhibit. 

R1 and R2 both advertise 10.50.1.0/24 to R3 and R4 as shown. R1 is the primary path. Which path does traffic take from the R4 data center to the file server? 

A. All traffic travels from R4 to R2 to the file server. 

B. All traffic travels from R4 to R3 to R1 to the file server. 

C. Traffic is load-balanced from R4 to R2 and R3. Traffic that is directed to R3 then continues to R1 to the file server. Traffic that is directed to R2 continues to the file server. 

D. All traffic travels from R4 to R2 to R1 to the file server. 

Answer: A 


Q5. Which two options are disadvantages of a commingled dual-tier WAN rate-based Ethernet circuit? (Choose two.) 

A. It requires the maintenance of separate chassis. 

B. It has limited scalability. 

C. It requires additional CPU resources at the subscriber end. 

D. It is more difficult to secure. 

E. It can increase the likelihood of packet drops. 

Answer: A,E 


Renewal ccie written dumps 400-101:

Q6. A service provider is deploying L2VPN LAN services in its MPLS cloud. Which statement is true regarding LDP signaling and autodiscovery? 

A. LDP signaling requires that each PE is identified, and that an LDP session is active with its P neighbor for autodiscovery to take place. 

B. LDP signaling requires that each P is identified, and that a targeted LDP session is active for autodiscovery to take place. 

C. LDP signaling requires that each PE is identified, and that a targeted LDP session with a BGP route reflector is active for autodiscovery to take place. 

D. LDP signaling requires that each PE is identified, and that a targeted LDP session is active for autodiscovery to take place. 

Answer: D 

Explanation: 

LDP signaling requires that each PE is identified and a targeted LDP session is active for autodiscovery to take place. Although the configuration can be automated using NMS/OSS the overall scalability of the solution is poor as a PE must be associated with all other PEs for LDP discovery to work, which can lead to a large number of targeted LDP sessions (n2), which may be largely unused as not all VPLS will be associated with every PE. The security attributes of LDP are reasonably good, although additional configuration is required to prevent unauthorized sessions being set up. Although LDP can signal additional attributes, it requires additional configuration either from an NMS/OSS or static configuration. 

Reference: http://www.cisco.com/en/US/products/hw/routers/ps368/products_white_paper09186a0080 1f6084.shtml 


Q7. Which two features are supported when Cisco HDLC is implemented? (Choose two.) 

A. error recovery 

B. error detection 

C. asynchronous links 

D. multiple protocols 

Answer: B,D 

Explanation: 

HDLC’s frame check sequence (FCS) is a 16-bit CRC-CCITT or a 32-bit CRC-32 computed over the Address, Control, and Information fields. It provides a means by which the receiver can detect errors that may have been induced during the transmission of the frame, such as lost bits, flipped bits, and extraneous bits. Cisco’s HDLC contains a proprietary field that is used to support multiple protocols. 

Reference: http://en.wikipedia.org/wiki/High-Level_Data_Link_Control 


Q8. In which way does the Bridge Assurance mechanism modify the default spanning-tree behavior in an effort to prevent bridging loops? 

A. Received BPDUs are looped back toward the sender to ensure that the link is bidirectional. 

B. If BPDUs are no longer received on a port, the switch immediately sends out a TCN BPDU. 

C. Extended topology information is encoded into all BPDUs. 

D. BPDUs are sent bidirectional on all active network ports, including blocked and alternate ports. 

Answer: D 


Q9. How is the MRU for a multilink bundle determined? 

A. It is negotiated by LCP. 

B. It is manually configured on the multilink bundle. 

C. It is manually configured on all physical interfaces of a multilink bundle. 

D. It is negotiated by NCP. 

E. It is negotiated by IPCP. 

Answer: A 


Q10. Which two options are BGP attributes that are updated when router sends an update to its eBGP peer? (Choose two.) 

A. weight 

B. local preference 

C. AS_path 

D. next-hop 

Answer: C,D 

Explanation: 

AS_Path describes the inter-AS path taken to reach a destination. It gives a list of AS Numbers traversed when reaching to a destination. Every BGP speaker when advertising a route to a peer will include its own AS number in the NLRI. The subsequent BGP speakers who advertise this route will add their own AS number to the AS_Path, the subsequent AS numbers get prepended to the list. The end result is the AS_Path attribute is able to describe all the autonomous systems it has traversed, beginning with the most recent AS and ending with the originating AS. 

NEXT_HOP Attribute specifies the next hop IP address to reach the destination advertised in the NLRI. NEXT_HOP is a well-known mandatory attribute that is included in every eBGP update. 

Reference: http://netcerts.net/bgp-path-attributes-and-the-decision-process/