Exam CS0-003 topic 1 question 43 discussion

D. function x() { info=$(traceroute -m 40 $1 | awk 'END{print $1}') && echo "$1 | $info" } This shell function uses traceroute to trace the route packets take to reach the destination specified by $1. The -m 40 option specifies a maximum of 40 hops for the trace. The awk 'END{print $1}' part extracts the final hop from the traceroute output, and then the function echoes the destination and the info.

Chat GPT says C due to getting ASN info from DNS

Explanation: traceroute -m 40 $1: Runs a traceroute with a maximum of 40 hops to analyze the route a packet takes to a given destination. awk 'END{print $1}': Extracts the last hop IP, which helps identify unexpected routes or reroutes (potential anomalies). echo "$1 | $info": Prints the input destination and the final hop, allowing for easy anomaly detection. This function is effective because it helps detect if a destination is taking an unusual or unexpected route, which could indicate routing anomalies, BGP hijacking, or malicious reroutes.

Reverse DNS Lookup (dig -x $1) Resolves the IP address into a domain name. Extracts the PTR Record (grep PTR | tail -n 1 | awk -F ".in-addr" '{print $1}') Pulls out the host information from the PTR record. Queries Cymru WHOIS ASN Database (origin.asn.cymru.com TXT +short) Retrieves ASN information, which identifies the network owner and routing information. This helps detect suspicious or hijacked routes.

The goal is to identify anomalies in network routing. Analyzing routing anomalies often involves identifying the Autonomous System (AS) associated with IP addresses. The function in C performs a reverse DNS lookup to find the PTR record of the IP address, uses the result to query the ASN information, and retrieves the AS details using the Cymru WHOIS service. This approach provides the most accurate and relevant routing information for identifying network anomalies compared to options like geoiplookup (A) or ping (B), which provide limited or unrelated routing insights. Traceroute (D) shows pathing but does not directly provide AS or routing anomaly detection information.

Correct answer hear is D. Don't forget we can't always answer this the way we would handle this in real life but more specifically the question wants the result for network routing. That is a trace route command basics all day. Trace route will tell us 4 key things here: hop by hop path (can't get this with C), router info (ip addresses so we know who or what has been in communication with our data), response times, and packet loss. If I want to know where my packets are going in the network and the path they take, bottlenecks, or path shortening for quicker communication (referring to network+), this is what you need to use. Most importantly this command allows us to see path changing that our data takes by being able to see all of the hops the data takes. What if its intercepted and sent to a C2C before arriving at its destination? Can't do that with C.

This function retrieves the ASN information for an IP address. The process starts by performing a reverse DNS lookup to get the domain name associated with the IP address, then queries the Cymru ASN service to get detailed ASN and routing information about the IP address. This can be useful for identifying which network or organization controls a particular IP address and can help with detecting anomalies in routing if, for example, traffic is being routed through an unexpected ASN.

wouldn't it be C? function x() { info=(dig(dig -x $1 | grep PTR | tail -n 1 | awk -F ".in-addr" '{print $1} ').origin.asn.cymru.com TXT +short) && echo "$1 | $info" } the function takes an IP address as an argument and performs two DNS lookups using the dig command. The first lookup uses the -x option to perform a reverse DNS lookup and get the hostname associated with the IP address. The second lookup uses the origin.asn.cymru.com domain to get the autonomous system number (ASN) and other info related to the IP address. function then prints the IP address and the ASN information, which can help identify any routing anomalies or inconsistencies.....not GPT...... used google/reddit and checked another dump site.

The function in option C is the most suitable for identifying routing anomalies because it leverages DNS and AS information, providing a comprehensive look at the network routing infrastructure relative to the IP address in question. It enables the analyst to see if the traffic to and from the IP address is being routed through expected or unexpected AS paths, which is crucial for detecting anomalies in network routing.

Among the provided options, option D (traceroute) is the most suitable for identifying anomalies on the network routing. Traceroute provides detailed information about each hop packets take to reach the destination, allowing the analyst to detect any unusual routing paths or issues.

This function executes a traceroute to the specified IP address and extracts the last hop reached. Traceroute can reveal the network path taken by packets, helping to identify routing anomalies such as unexpected hops or routing loops. Among the options provided, option D (traceroute) is the most relevant for identifying anomalies on the network routing.

This function performs a reverse DNS lookup (dig -x $1) on the IP address $1 to get the corresponding domain name. It then extracts the Autonomous System Number (ASN) information from the result using awk and queries the ASN information from the origin.asn.cymru.com service. This can help identify anomalies in network routing by associating IP addresses with their corresponding ASN, providing insights into the routing path and potential routing issues.

network anomalies. I'd start with a traceroute to see the nodes my connection runs through. I do this when customer's are having non-equipment related problems, related to internet connection. All ISPs are interconnected and if they lose a node, traffic may be re-routed, which can increase latency.

D: Uses traceroute to display the route packets take to reach a network host. For identifying anomalies in network routing, the function that would be most relevant is: D. function x() { info=$(traceroute -m 40 $1 | awk ‘END{print $1}’) && echo "$1 | $info" } traceroute shows the path that packets take to get from the source machine to the destination. This can help identify if there are unexpected or inefficient routes, timeouts, or other anomalies that might indicate a routing issue. The other functions gather useful data but are not as directly applicable to identifying routing anomalies.

To identify anomalies on the network routing accurately, the security analyst should use a function that can help in gathering information related to the network routing of a given IP address. Among the provided options, the most suitable function for this purpose is: D. function x() { info=$(traceroute -m 40 $1 | awk 'END{print $1}') && echo "$1 | $info" } Explanation: This function uses the "traceroute" command with a maximum hop count of 40 to trace the route to the target IP address. The "awk 'END{print $1}'" command is used to extract the last hop or router in the route, which can be valuable for identifying anomalies or unexpected routing paths. Finally, it echoes the target IP address and the last hop/router in the route as output, which can help the analyst identify any unexpected or suspicious routing behavior.

Option C captures ASN info, D monitors the routes.