350-401 Exam Preparation Material with New 350-401 Dumps Questions [Q155-Q171]

Explanation
The ip sla 10 will ping the IP 192.168.10.20 every 3 seconds to make sure the connection is still up. We can configure an EEM applet if there is any problem with this IP SLA via the command event track 10 state down.
Reference: https://www.theroutingtable.com/ip-sla-and-cisco-eem/

Explanation
Marking = applied on traffic to convey Information to a downstream device Classification = distinguish traffic types Trust = Permits traffic to pass through the device while retaining DSCP/COS values shapping = process used to buffer traffic that exceeds a predefined rate.

Explanation/Reference: https://www.cisco.com/c/dam/en/us/td/docs/solutions/CVD/SDWAN/CVD-SD-WAN-Design-
2018OCT.pdf

Explanation
A picture containing graphical user interface Description automatically generated

Explanation
Mobility Express is the ability to use an access point (AP) as a controller instead of a real WLAN controller.
But this solution is only suitable for small to midsize, or multi-site branch locations where you might not want to invest in a dedicated WLC. answer ‘Autonomous’ Mobility Express WLC can support up to 100 APs.
Mobility Express WLC also uses CAPWAP to communicate to other APs.
Note: Local mode is the most common mode that an AP operates in. This is also the default mode. In local mode, the LAP maintains a CAPWAP (or LWAPP) tunnel to its associated controller.

Explanation
The %TUN-5-RECURDOWN: Tunnel0 temporarily disabled due to recursive routing error message means that the generic routing encapsulation (GRE) tunnel router has discovered a recursive routing problem. This condition is usually due to one of these causes:
+ A misconfiguration that causes the router to try to route to the tunnel destination address using the tunnel interface itself (recursive routing)
+ A temporary instability caused by route flapping elsewhere in the network Reference: https://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routingprotocol- eigrp/22327-gre-flap.html

MACsec, defined in 802.1AE, provides MAC-layer encryption over wired networks by using out-ofband
methods for encryption keying. The MACsec Key Agreement (MKA) Protocol provides the

With BGP, we must advertise the correct network and subnet mask in the “network” command (in this case network 10.1.1.0/24 on R1 and network 10.2.2.0/24 on R2). BGP is very strict in the routing advertisements. In other words, BGP only advertises the network which exists exactly in the routing table. In this case, if you put the command “network x.x.0.0 mask 255.255.0.0” or
“network x.0.0.0 mask 255.0.0.0” or “network x.x.x.x mask 255.255.255.255” then BGP will not advertise anything.
It is easy to establish eBGP neighborship via the direct link. But let’s see what are required when we want to establish eBGP neighborship via their loopback interfaces. We will need two commands:
+ the command “neighbor 10.1.1.1 ebgp-multihop 2” on R1 and “neighbor 10.2.2.2 ebgpmultihop
2″ on R1. This command increases the TTL value to 2 so that BGP updates can reach the BGP neighbor which is two hops away.
+ Answer ‘R1 (config) #router bgp 1
R1 (config-router) #neighbor 192.168.10.2 remote-as 2
R1 (config-router) #network 10.1.1.0 mask 255.255.255.0
R2 (config) #router bgp 2
R2 (config-router) #neighbor 192.168.10.1 remote-as 1
R2 (config-router) #network 10.2.2.0 mask 255.255.255.0
Quick Wireless Summary
Cisco Access Points (APs) can operate in one of two modes: autonomous or lightweight
+ Autonomous: self-sufficient and standalone. Used for small wireless networks.
+ Lightweight: A Cisco lightweight AP (LAP) has to join a Wireless LAN Controller (WLC) to function.
LAP and WLC communicate with each other via a logical pair of CAPWAP tunnels.
– Control and Provisioning for Wireless Access Point (CAPWAP) is an IETF standard for control messaging for setup, authentication and operations between APs and WLCs. CAPWAP is similar to LWAPP except the following differences:
+CAPWAP uses Datagram Transport Layer Security (DTLS) for authentication and encryption to protect traffic between APs and controllers. LWAPP uses AES.
+ CAPWAP has a dynamic maximum transmission unit (MTU) discovery mechanism.
+ CAPWAP runs on UDP ports 5246 (control messages) and 5247 (data messages) An LAP operates in one of six different modes:
+ Local mode (default mode): measures noise floor and interference, and scans for intrusion detection (IDS) events every 180 seconds on unused channels
+ FlexConnect, formerly known as Hybrid Remote Edge AP (H-REAP), mode: allows data traffic to be switched locally and not go back to the controller. The FlexConnect AP can perform standalone client authentication and switch VLAN traffic locally even when it’s disconnected to the WLC (Local Switched). FlexConnect AP can also tunnel (via CAPWAP) both user wireless data and control traffic to a centralized WLC (Central Switched).
+ Monitor mode: does not handle data traffic between clients and the infrastructure. It acts like a sensor for location-based services (LBS), rogue AP detection, and IDS
+ Rogue detector mode: monitor for rogue APs. It does not handle data at all.
+ Sniffer mode: run as a sniffer and captures and forwards all the packets on a particular channel to a remote machine where you can use protocol analysis tool (Wireshark, Airopeek, etc) to review the packets and diagnose issues. Strictly used for troubleshooting purposes.
+ Bridge mode: bridge together the WLAN and the wired infrastructure together.
Mobility Express is the ability to use an access point (AP) as a controller instead of a real WLAN controller. But this solution is only suitable for small to midsize, or multi-site branch locations where you might not want to invest in a dedicated WLC. A Mobility Express WLC can support up to 100 Aps

Explanation
Local preference is an indication to the AS about which path has preference to exit the AS in order to reach a certain network. A path with a higher local preference is preferred. The default value for local preference is 100.
Unlike the weight attribute, which is only relevant to the local router, local preference is an attribute that routers exchange in the same AS. The local preference is set with the “bgp default local-preference value” command.
In this case, both R3 & R4 have exit links but R4 has higher local-preference so R4 will be chosen as the preferred exit point from AS 200.