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2021 Jul gaggenau ah 400-101:

Q11. Which regular expression will only allow prefixes that originated from AS 65000 and that are learned through AS 65001? 

A. ^65000_65001$ 

B. 65000_65001$ 

C. ^65000_65001 

D. ^65001_65000$ 

Answer: D 

Explanation: 

The following table lists the regular expressions and their meanings: 

+------------------------------------------------------+ 

| CHAR | USAGE | 

+------------------------------------------------------| 

| ^ | Start of string | 

|------|-----------------------------------------------| 

| $ | End of string | 

|------|-----------------------------------------------| 

| [] | Range of characters | 

|------|-----------------------------------------------| 

| - | Used to specify range ( i.e. [0-9] ) | 

|------|-----------------------------------------------| 

| ( ) | Logical grouping | 

|------|-----------------------------------------------| 

| . | Any single character | 

|------|-----------------------------------------------| 

| * | Zero or more instances | 

|------|-----------------------------------------------| 

| + | One or more instance | 

|------|-----------------------------------------------| 

| ? | Zero or one instance | 

|------|-----------------------------------------------| 

| _ | Comma, open or close brace, open or close | 

| | parentheses, start or end of string, or space | 

+------------------------------------------------------+ 

Some commonly used regular expressions include: 

+-------------+---------------------------+ 

| Expression | Meaning | 

|-------------+---------------------------| 

| .* | Anything | 

|-------------+---------------------------| 

| ^$ | Locally originated routes | 

|-------------+---------------------------| 

| ^100_ | Learned from AS 100 | 

|-------------+---------------------------| 

| _100$ | Originated in AS 100 | 

|-------------+---------------------------| 

| _100_ | Any instance of AS 100 | 

|-------------+---------------------------| 

| ^[0-9]+$ | Directly connected ASes | 

+-------------+---------------------------+ 

Reference: http://blog.ine.com/2008/01/06/understanding-bgp-regular-expressions/ 


Q12. Refer to the exhibit. 


How can Router X in AS70000 peer with Router Y in AS65000, in case Router Y supports only 2-byte ASNs? 

A. Router X should be configured with a remove-private-as command, because this will establish the peering session with a random private 2-byte ASN. 

B. It is not possible. Router Y must be upgraded to an image that supports 4-byte ASN. 

C. Router Y should be configured with a 4-byte AS using the local-as command. 

D. Router X should be configured with a 2-byte AS using the local-as command. 

Answer: D 

Explanation: 

Since router Y does not support 4-byte ASN,s it will not understand any AS numbers larger than 65535, so router X should use the local-as command on the peering statement to router Y to so that it sends in a 2-byte ASN to router Y. 


Q13. Refer to the exhibit. 


Which AS paths are matched by this access list? 

A. the origin AS 64496 only 

B. the origin AS 64496 and any ASs after AS 64496 

C. the directly attached AS 64496 and any ASs directly attached to AS 64496 

D. the directly attached AS 64496 and any longer AS paths 

Answer: C 

Explanation: 

If you want AS 1 to get networks originated from AS 4 and all directly attached ASs of AS 4, apply the following inbound filter on Router 1. ip as-path access-list 1 permit ^4_[0-9]*$ router bgp 1 neighbor 4.4.4.4 remote-as 4 neighbor 4.4.4.4 route-map foo in route-map foo permit 10 match as-path 1 In the ip as-path access-list command, the carat (^) starts the input string and designates "AS". The underscore (_) means there is a a null string in the string that follows "AS 4". The [0-9]* specifies that any connected AS with a valid AS number can pass the filter. The advantage of using the [0-9]* syntax is that it gives you the flexibility to add any number of ASs without modifying this command string. 

Reference: http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13754-26.html 


Q14. Which two statements about GLBP are true? (Choose two.) 

A. Packets are forwarded by multiple routers that share one virtual IP address. 

B. The active router forwards packets received on one virtual IP and MAC address. 

C. The standby router forwards packets when the active router fails. 

D. Hosts on the network are configured with multiple gateways for load balancing. 

E. Routers in a GLBP group can share multiple virtual MAC addresses. 

Answer: A,E 


Q15. Which two statements about IS-IS are true? (Choose two.) 

A. The default hello interval is 10 seconds and the default hold timer is 30 seconds. 

B. The hello interval can be changed on a per-interface basis with the command isis hello-multiplier. 

C. Both routers need to have the same hello intervals and hold timers in order to form IS-IS neighbors. 

D. Both IS-IS routers need to have the same capabilities in the hello packet in order to form neighbors. 

Answer: A,B 

Explanation: 

isis hello-interval 

To specify the length of time between hello packets that the Cisco IOS software sends, use the isis hello-interval command in interface configuration mode. By default, a value three times the hello interval seconds is advertised as the hold time in the hello packets sent. (Change the multiplier of 3 by specifying the isis hello-multiplier command.) With smaller hello intervals, topological changes are detected faster, but there is more routing traffic. The default is 10 seconds. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/iproute/command/reference/fiprrp_r/1rfisis.ht ml 


400-101 sample question

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Q16. Which three TLVs does LLDP use to discover network devices? (Choose three.) 

A. Management address 

B. Port description 

C. Network policy 

D. System name 

E. Location information 

F. Power management 

Answer: A,B,D 

Explanation: 

Basic Management TLV Set 

This set includes the following five TLVs used in LLDP: 

. Port description TLV: Provides a description of the port in an alpha-numeric format. The value equals the ifDescr object, if the LAN device supports RFC 2863. 

. System name TLV: Provides the system's assigned name in an alpha-numeric format. The value equals the sysName object, if the LAN device supports RFC 3418. 

. System description TLV: Provides a description of the network entity in an alpha-numeric format. This includes system's name and versions of hardware, operating system and networking software supported in the device. The value equals the sysDescr object, if the LAN device supports RFC 3418. 

. System capabilities TLV: Indicates the primary function(s) of the device and whether or not these functions are enabled in the device. The capabilities are indicated by two octects. Bits 0 through 7 indicate Other, Repeater, Bridge, WLAN AP, Router, Telephone, DOCSIS cable device and Station respectively. Bits 8 through 15 are reserved. 

. Management address TLV: Indicates the addresses of the local LLDP agent. Other remote managers can use this address to obtain information related to the local device. 

Reference: http://www.eetimes.com/document.asp?doc_id=1272069 


Q17. Which statement describes the effect of the configuration line redistribute maximum-prefix 1500 90 withdraw? 

A. After the 1500th route is redistributed, a warning is posted in the log file and 90 more routes are redistributed before further routes are discarded. 

B. After the 1350th route is redistributed, a warning is posted in the log file until the 1500th route is redistributed, and then further routes are discarded. 

C. After the 1500th route is redistributed, further routes are discarded only if the CPU is above 90%. 

D. The routing protocol receives 1500 routes. After the routing process has redistributed 90% of the routes, the process supernets routes and injects a NULL route to prevent black-hole routing. 

Answer: B 


Q18. Which statement about LISP encapsulation in an EIGRP OTP implementation is true? 

A. OTP uses LISP encapsulation for dynamic multipoint tunneling. 

B. OTP maintains the LISP control plane. 

C. OTP uses LISP encapsulation to obtain routes from neighbors. 

D. LISP learns the next hop. 

Answer: A 


Q19. Refer to the exhibit. 


What is wrong with the configuration of the tunnel interface of this DMVPN Phase II spoke router? 

A. The interface MTU is too high. 

B. The tunnel destination is missing. 

C. The NHRP NHS IP address is wrong. 

D. The tunnel mode is wrong. 

Answer: D 

Explanation: 

By default, tunnel interfaces use GRE as the tunnel mode, but a DMVPN router needs to be configured for GRE multipoint by using the “tunnel mode gre multipoint” interface command. 


Q20. Which two statements are true about OTV? (Choose two.) 

A. It relies on flooding to propagate MAC address reachability information. 

B. It uses a full mesh of point-to-multipoint tunnels to prevent head-end replication of multicast traffic. 

C. It can work over any transport that can forward IP packets. 

D. It supports automatic detection of multihoming. 

Answer: C,D 

Explanation: 

The overlay nature of OTV allows it to work over any transport as long as this transport can forward IP packets. Any optimizations performed for IP in the transport will benefit the OTV encapsulated traffic. As part of the OTV control protocol, automatic detection of multihoming is included. This feature enables the multihoming of sites without requiring additional configuration or protocols 

Reference: http://www.cisco.com/c/en/us/products/collateral/switches/nexus-7000-series-switches/white_paper_c11-574984.html